Properties

Label 20.20.184...000.1
Degree $20$
Signature $(20, 0)$
Discriminant $1.845\times 10^{38}$
Root discriminant \(81.90\)
Ramified primes $2,3,5$
Class number $2$ (GRH)
Class group [2] (GRH)
Galois group $C_{20}$ (as 20T1)

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Normalized defining polynomial

Copy content comment:Define the number field
 
Copy content sage:x = polygen(QQ); K.<a> = NumberField(x^20 - 120*x^18 + 6120*x^16 - 172800*x^14 + 2948400*x^12 - 31142880*x^10 + 200620800*x^8 - 748828800*x^6 + 1469664000*x^4 - 1259712000*x^2 + 302330880)
 
Copy content gp:K = bnfinit(y^20 - 120*y^18 + 6120*y^16 - 172800*y^14 + 2948400*y^12 - 31142880*y^10 + 200620800*y^8 - 748828800*y^6 + 1469664000*y^4 - 1259712000*y^2 + 302330880, 1)
 
Copy content magma:R<x> := PolynomialRing(Rationals()); K<a> := NumberField(x^20 - 120*x^18 + 6120*x^16 - 172800*x^14 + 2948400*x^12 - 31142880*x^10 + 200620800*x^8 - 748828800*x^6 + 1469664000*x^4 - 1259712000*x^2 + 302330880);
 
Copy content oscar:Qx, x = polynomial_ring(QQ); K, a = number_field(x^20 - 120*x^18 + 6120*x^16 - 172800*x^14 + 2948400*x^12 - 31142880*x^10 + 200620800*x^8 - 748828800*x^6 + 1469664000*x^4 - 1259712000*x^2 + 302330880)
 

\( x^{20} - 120 x^{18} + 6120 x^{16} - 172800 x^{14} + 2948400 x^{12} - 31142880 x^{10} + 200620800 x^{8} + \cdots + 302330880 \) Copy content Toggle raw display

Copy content comment:Defining polynomial
 
Copy content sage:K.defining_polynomial()
 
Copy content gp:K.pol
 
Copy content magma:DefiningPolynomial(K);
 
Copy content oscar:defining_polynomial(K)
 

Invariants

Degree:  $20$
Copy content comment:Degree over Q
 
Copy content sage:K.degree()
 
Copy content gp:poldegree(K.pol)
 
Copy content magma:Degree(K);
 
Copy content oscar:degree(K)
 
Signature:  $(20, 0)$
Copy content comment:Signature
 
Copy content sage:K.signature()
 
Copy content gp:K.sign
 
Copy content magma:Signature(K);
 
Copy content oscar:signature(K)
 
Discriminant:   \(184528125000000000000000000000000000000\) \(\medspace = 2^{30}\cdot 3^{10}\cdot 5^{35}\) Copy content Toggle raw display
Copy content comment:Discriminant
 
Copy content sage:K.disc()
 
Copy content gp:K.disc
 
Copy content magma:OK := Integers(K); Discriminant(OK);
 
Copy content oscar:OK = ring_of_integers(K); discriminant(OK)
 
Root discriminant:  \(81.90\)
Copy content comment:Root discriminant
 
Copy content sage:(K.disc().abs())^(1./K.degree())
 
Copy content gp:abs(K.disc)^(1/poldegree(K.pol))
 
Copy content magma:Abs(Discriminant(OK))^(1/Degree(K));
 
Copy content oscar:OK = ring_of_integers(K); (1.0 * abs(discriminant(OK)))^(1/degree(K))
 
Galois root discriminant:  $2^{3/2}3^{1/2}5^{7/4}\approx 81.903625881272$
Ramified primes:   \(2\), \(3\), \(5\) Copy content Toggle raw display
Copy content comment:Ramified primes
 
Copy content sage:K.disc().support()
 
Copy content gp:factor(abs(K.disc))[,1]~
 
Copy content magma:PrimeDivisors(Discriminant(OK));
 
Copy content oscar:prime_divisors(discriminant(OK))
 
Discriminant root field:  \(\Q(\sqrt{5}) \)
$\Aut(K/\Q)$ $=$ $\Gal(K/\Q)$:   $C_{20}$
Copy content comment:Automorphisms
 
Copy content sage:K.automorphisms()
 
Copy content magma:Automorphisms(K);
 
Copy content oscar:automorphism_group(K)
 
This field is Galois and abelian over $\Q$.
Conductor:  \(600=2^{3}\cdot 3\cdot 5^{2}\)
Dirichlet character group:    $\lbrace$$\chi_{600}(1,·)$, $\chi_{600}(197,·)$, $\chi_{600}(481,·)$, $\chi_{600}(77,·)$, $\chi_{600}(173,·)$, $\chi_{600}(529,·)$, $\chi_{600}(533,·)$, $\chi_{600}(409,·)$, $\chi_{600}(413,·)$, $\chi_{600}(289,·)$, $\chi_{600}(293,·)$, $\chi_{600}(49,·)$, $\chi_{600}(169,·)$, $\chi_{600}(557,·)$, $\chi_{600}(241,·)$, $\chi_{600}(437,·)$, $\chi_{600}(361,·)$, $\chi_{600}(121,·)$, $\chi_{600}(317,·)$, $\chi_{600}(53,·)$$\rbrace$
This is not a CM field.
This field has no CM subfields.

Integral basis (with respect to field generator \(a\))

$1$, $a$, $\frac{1}{6}a^{2}$, $\frac{1}{6}a^{3}$, $\frac{1}{36}a^{4}$, $\frac{1}{36}a^{5}$, $\frac{1}{216}a^{6}$, $\frac{1}{216}a^{7}$, $\frac{1}{1296}a^{8}$, $\frac{1}{1296}a^{9}$, $\frac{1}{7776}a^{10}$, $\frac{1}{7776}a^{11}$, $\frac{1}{46656}a^{12}$, $\frac{1}{46656}a^{13}$, $\frac{1}{279936}a^{14}$, $\frac{1}{279936}a^{15}$, $\frac{1}{1679616}a^{16}$, $\frac{1}{1679616}a^{17}$, $\frac{1}{10077696}a^{18}$, $\frac{1}{10077696}a^{19}$ Copy content Toggle raw display

Copy content comment:Integral basis
 
Copy content sage:K.integral_basis()
 
Copy content gp:K.zk
 
Copy content magma:IntegralBasis(K);
 
Copy content oscar:basis(OK)
 

Monogenic:  Not computed
Index:  $1$
Inessential primes:  None

Class group and class number

Ideal class group:  $C_{2}$, which has order $2$ (assuming GRH)
Copy content comment:Class group
 
Copy content sage:K.class_group().invariants()
 
Copy content gp:K.clgp
 
Copy content magma:ClassGroup(K);
 
Copy content oscar:class_group(K)
 
Narrow class group:  $C_{2}\times C_{2}$, which has order $4$ (assuming GRH)
Copy content comment:Narrow class group
 
Copy content sage:K.narrow_class_group().invariants()
 
Copy content gp:bnfnarrow(K)
 
Copy content magma:NarrowClassGroup(K);
 

Unit group

Copy content comment:Unit group
 
Copy content sage:UK = K.unit_group()
 
Copy content magma:UK, fUK := UnitGroup(K);
 
Copy content oscar:UK, fUK = unit_group(OK)
 
Rank:  $19$
Copy content comment:Unit rank
 
Copy content sage:UK.rank()
 
Copy content gp:K.fu
 
Copy content magma:UnitRank(K);
 
Copy content oscar:rank(UK)
 
Torsion generator:   \( -1 \)  (order $2$) Copy content Toggle raw display
Copy content comment:Generator for roots of unity
 
Copy content sage:UK.torsion_generator()
 
Copy content gp:K.tu[2]
 
Copy content magma:K!f(TU.1) where TU,f is TorsionUnitGroup(K);
 
Copy content oscar:torsion_units_generator(OK)
 
Fundamental units:   $\frac{1}{7776}a^{10}-\frac{5}{648}a^{8}+\frac{35}{216}a^{6}-\frac{25}{18}a^{4}+\frac{25}{6}a^{2}-2$, $\frac{1}{36}a^{4}-\frac{2}{3}a^{2}+2$, $\frac{1}{1296}a^{8}-\frac{1}{27}a^{6}+\frac{5}{9}a^{4}-\frac{8}{3}a^{2}+2$, $\frac{1}{6}a^{2}-2$, $\frac{1}{279936}a^{14}-\frac{13}{46656}a^{12}+\frac{11}{1296}a^{10}-\frac{55}{432}a^{8}+\frac{35}{36}a^{6}-\frac{127}{36}a^{4}+\frac{31}{6}a^{2}-2$, $\frac{1}{10077696}a^{18}-\frac{17}{1679616}a^{16}+\frac{59}{139968}a^{14}-\frac{143}{15552}a^{12}+\frac{871}{7776}a^{10}-\frac{61}{81}a^{8}+\frac{283}{108}a^{6}-\frac{157}{36}a^{4}+\frac{7}{2}a^{2}-2$, $\frac{1}{1679616}a^{16}-\frac{1}{17496}a^{14}+\frac{13}{5832}a^{12}-\frac{353}{7776}a^{10}+\frac{223}{432}a^{8}-\frac{175}{54}a^{6}+\frac{31}{3}a^{4}-\frac{27}{2}a^{2}+3$, $\frac{1}{46656}a^{12}-\frac{1}{648}a^{10}+\frac{1}{24}a^{8}-\frac{14}{27}a^{6}+\frac{35}{12}a^{4}-6a^{2}+2$, $\frac{1}{216}a^{6}-\frac{1}{6}a^{4}+\frac{3}{2}a^{2}-2$, $\frac{1}{279936}a^{14}-\frac{7}{23328}a^{12}+\frac{77}{7776}a^{10}-\frac{35}{216}a^{8}+\frac{1}{216}a^{7}+\frac{49}{36}a^{6}-\frac{7}{36}a^{5}-\frac{49}{9}a^{4}+\frac{7}{3}a^{3}+\frac{49}{6}a^{2}-7a+1$, $\frac{1}{10077696}a^{18}-\frac{1}{93312}a^{16}+\frac{5}{10368}a^{14}-\frac{547}{46656}a^{12}+\frac{1}{7776}a^{11}+\frac{433}{2592}a^{10}-\frac{11}{1296}a^{9}-\frac{1837}{1296}a^{8}+\frac{11}{54}a^{7}+\frac{251}{36}a^{6}-\frac{77}{36}a^{5}-\frac{665}{36}a^{4}+\frac{55}{6}a^{3}+\frac{67}{3}a^{2}-11a-11$, $\frac{1}{10077696}a^{18}-\frac{1}{93312}a^{16}+\frac{5}{10368}a^{14}-\frac{91}{7776}a^{12}+\frac{143}{864}a^{10}-\frac{1}{1296}a^{9}-\frac{11}{8}a^{8}+\frac{1}{24}a^{7}+\frac{77}{12}a^{6}-\frac{3}{4}a^{5}-15a^{4}+5a^{3}+\frac{27}{2}a^{2}-9a+1$, $\frac{1}{1679616}a^{17}-\frac{1}{1679616}a^{16}-\frac{17}{279936}a^{15}+\frac{1}{17496}a^{14}+\frac{119}{46656}a^{13}-\frac{13}{5832}a^{12}-\frac{221}{3888}a^{11}+\frac{11}{243}a^{10}+\frac{935}{1296}a^{9}-\frac{55}{108}a^{8}-\frac{187}{36}a^{7}+\frac{28}{9}a^{6}+\frac{119}{6}a^{5}-\frac{28}{3}a^{4}-34a^{3}+\frac{32}{3}a^{2}+17a+1$, $\frac{1}{1679616}a^{17}-\frac{17}{279936}a^{15}+\frac{59}{23328}a^{13}-\frac{143}{2592}a^{11}+\frac{145}{216}a^{9}-\frac{967}{216}a^{7}+\frac{539}{36}a^{5}+\frac{1}{36}a^{4}-21a^{3}-\frac{2}{3}a^{2}+8a-1$, $\frac{1}{216}a^{6}-\frac{1}{6}a^{4}+\frac{1}{6}a^{3}+\frac{3}{2}a^{2}-3a+1$, $\frac{1}{10077696}a^{19}-\frac{1}{3359232}a^{18}-\frac{1}{93312}a^{17}+\frac{17}{559872}a^{16}+\frac{5}{10368}a^{15}-\frac{59}{46656}a^{14}-\frac{547}{46656}a^{13}+\frac{643}{23328}a^{12}+\frac{433}{2592}a^{11}-\frac{2597}{7776}a^{10}-\frac{1837}{1296}a^{9}+\frac{709}{324}a^{8}+\frac{251}{36}a^{7}-\frac{61}{9}a^{6}-\frac{166}{9}a^{5}+\frac{107}{18}a^{4}+\frac{43}{2}a^{3}+\frac{20}{3}a^{2}-4a-4$, $\frac{1}{559872}a^{16}-\frac{47}{279936}a^{14}+\frac{299}{46656}a^{12}+\frac{1}{7776}a^{11}-\frac{55}{432}a^{10}-\frac{5}{648}a^{9}+\frac{907}{648}a^{8}+\frac{1}{6}a^{7}-\frac{1799}{216}a^{6}-\frac{14}{9}a^{5}+\frac{869}{36}a^{4}+\frac{17}{3}a^{3}-\frac{80}{3}a^{2}-4a+6$, $\frac{1}{6}a^{2}-a+1$, $\frac{1}{10077696}a^{19}-\frac{19}{1679616}a^{17}+\frac{151}{279936}a^{15}-\frac{1}{279936}a^{14}-\frac{649}{46656}a^{13}+\frac{1}{2916}a^{12}+\frac{1625}{7776}a^{11}-\frac{17}{1296}a^{10}-\frac{263}{144}a^{9}+\frac{109}{432}a^{8}+\frac{467}{54}a^{7}-\frac{181}{72}a^{6}-\frac{217}{12}a^{5}+\frac{106}{9}a^{4}+7a^{3}-\frac{115}{6}a^{2}+8a+11$ Copy content Toggle raw display (assuming GRH)
Copy content comment:Fundamental units
 
Copy content sage:UK.fundamental_units()
 
Copy content gp:K.fu
 
Copy content magma:[K|fUK(g): g in Generators(UK)];
 
Copy content oscar:[K(fUK(a)) for a in gens(UK)]
 
Regulator:  \( 2584911672430 \) (assuming GRH)
Copy content comment:Regulator
 
Copy content sage:K.regulator()
 
Copy content gp:K.reg
 
Copy content magma:Regulator(K);
 
Copy content oscar:regulator(K)
 
Unit signature rank:  \( 19 \) (assuming GRH)

Class number formula

\[ \begin{aligned}\lim_{s\to 1} (s-1)\zeta_K(s) =\mathstrut & \frac{2^{r_1}\cdot (2\pi)^{r_2}\cdot R\cdot h}{w\cdot\sqrt{|D|}}\cr \approx\mathstrut &\frac{2^{20}\cdot(2\pi)^{0}\cdot 2584911672430 \cdot 2}{2\cdot\sqrt{184528125000000000000000000000000000000}}\cr\approx \mathstrut & 0.199532818164173 \end{aligned}\] (assuming GRH)

Copy content comment:Analytic class number formula
 
Copy content sage:# self-contained SageMath code snippet to compute the analytic class number formula x = polygen(QQ); K.<a> = NumberField(x^20 - 120*x^18 + 6120*x^16 - 172800*x^14 + 2948400*x^12 - 31142880*x^10 + 200620800*x^8 - 748828800*x^6 + 1469664000*x^4 - 1259712000*x^2 + 302330880) DK = K.disc(); r1,r2 = K.signature(); RK = K.regulator(); RR = RK.parent() hK = K.class_number(); wK = K.unit_group().torsion_generator().order(); 2^r1 * (2*RR(pi))^r2 * RK * hK / (wK * RR(sqrt(abs(DK))))
 
Copy content gp:\\ self-contained Pari/GP code snippet to compute the analytic class number formula K = bnfinit(x^20 - 120*x^18 + 6120*x^16 - 172800*x^14 + 2948400*x^12 - 31142880*x^10 + 200620800*x^8 - 748828800*x^6 + 1469664000*x^4 - 1259712000*x^2 + 302330880, 1); [polcoeff (lfunrootres (lfuncreate (K))[1][1][2], -1), 2^K.r1 * (2*Pi)^K.r2 * K.reg * K.no / (K.tu[1] * sqrt (abs (K.disc)))]
 
Copy content magma:/* self-contained Magma code snippet to compute the analytic class number formula */ Qx<x> := PolynomialRing(Rationals()); K<a> := NumberField(x^20 - 120*x^18 + 6120*x^16 - 172800*x^14 + 2948400*x^12 - 31142880*x^10 + 200620800*x^8 - 748828800*x^6 + 1469664000*x^4 - 1259712000*x^2 + 302330880); OK := Integers(K); DK := Discriminant(OK); UK, fUK := UnitGroup(OK); clK, fclK := ClassGroup(OK); r1,r2 := Signature(K); RK := Regulator(K); RR := Parent(RK); hK := #clK; wK := #TorsionSubgroup(UK); 2^r1 * (2*Pi(RR))^r2 * RK * hK / (wK * Sqrt(RR!Abs(DK)));
 
Copy content oscar:# self-contained Oscar code snippet to compute the analytic class number formula Qx, x = polynomial_ring(QQ); K, a = number_field(x^20 - 120*x^18 + 6120*x^16 - 172800*x^14 + 2948400*x^12 - 31142880*x^10 + 200620800*x^8 - 748828800*x^6 + 1469664000*x^4 - 1259712000*x^2 + 302330880); OK = ring_of_integers(K); DK = discriminant(OK); UK, fUK = unit_group(OK); clK, fclK = class_group(OK); r1,r2 = signature(K); RK = regulator(K); RR = parent(RK); hK = order(clK); wK = torsion_units_order(K); 2^r1 * (2*pi)^r2 * RK * hK / (wK * sqrt(RR(abs(DK))))
 

Galois group

$C_{20}$ (as 20T1):

Copy content comment:Galois group
 
Copy content sage:K.galois_group()
 
Copy content gp:polgalois(K.pol)
 
Copy content magma:G = GaloisGroup(K);
 
Copy content oscar:G, Gtx = galois_group(K); degree(K) > 1 ? (G, transitive_group_identification(G)) : (G, nothing)
 
A cyclic group of order 20
The 20 conjugacy class representatives for $C_{20}$
Character table for $C_{20}$

Intermediate fields

\(\Q(\sqrt{5}) \), \(\Q(\sqrt{15 +3 \sqrt{5}})\), 5.5.390625.1, \(\Q(\zeta_{25})^+\)

Fields in the database are given up to isomorphism. Isomorphic intermediate fields are shown with their multiplicities.

Copy content comment:Intermediate fields
 
Copy content sage:K.subfields()[1:-1]
 
Copy content gp:L = nfsubfields(K); L[2..length(L)]
 
Copy content magma:L := Subfields(K); L[2..#L];
 
Copy content oscar:subfields(K)[2:end-1]
 

Frobenius cycle types

$p$ $2$ $3$ $5$ $7$ $11$ $13$ $17$ $19$ $23$ $29$ $31$ $37$ $41$ $43$ $47$ $53$ $59$
Cycle type R R R ${\href{/padicField/7.4.0.1}{4} }^{5}$ ${\href{/padicField/11.5.0.1}{5} }^{4}$ $20$ $20$ ${\href{/padicField/19.5.0.1}{5} }^{4}$ $20$ ${\href{/padicField/29.10.0.1}{10} }^{2}$ ${\href{/padicField/31.5.0.1}{5} }^{4}$ $20$ ${\href{/padicField/41.10.0.1}{10} }^{2}$ ${\href{/padicField/43.4.0.1}{4} }^{5}$ $20$ $20$ ${\href{/padicField/59.10.0.1}{10} }^{2}$

In the table, R denotes a ramified prime. Cycle lengths which are repeated in a cycle type are indicated by exponents.

Copy content comment:Frobenius cycle types
 
Copy content sage:# to obtain a list of [e_i,f_i] for the factorization of the ideal pO_K for p=7 in Sage: p = 7; [(e, pr.norm().valuation(p)) for pr,e in K.factor(p)]
 
Copy content gp:\\ to obtain a list of [e_i,f_i] for the factorization of the ideal pO_K for p=7 in Pari: p = 7; pfac = idealprimedec(K, p); vector(length(pfac), j, [pfac[j][3], pfac[j][4]])
 
Copy content magma:// to obtain a list of [e_i,f_i] for the factorization of the ideal pO_K for p=7 in Magma: p := 7; [<pr[2], Valuation(Norm(pr[1]), p)> : pr in Factorization(p*Integers(K))];
 
Copy content oscar:# to obtain a list of [e_i,f_i] for the factorization of the ideal pO_K for p=7 in Oscar: p = 7; pfac = factor(ideal(ring_of_integers(K), p)); [(e, valuation(norm(pr),p)) for (pr,e) in pfac]
 

Local algebras for ramified primes

$p$LabelPolynomial $e$ $f$ $c$ Galois group Slope content
\(2\) Copy content Toggle raw display 2.10.2.30a1.114$x^{20} + 2 x^{16} + 2 x^{15} + 2 x^{13} + 3 x^{12} + 4 x^{11} + 7 x^{10} + 2 x^{9} + 4 x^{8} + 4 x^{7} + 9 x^{6} + 16 x^{5} + 3 x^{4} + 8 x^{3} + 7 x^{2} + 6 x + 7$$2$$10$$30$20T1not computed
\(3\) Copy content Toggle raw display 3.10.2.10a1.1$x^{20} + 4 x^{16} + 4 x^{15} + 4 x^{14} + 4 x^{12} + 10 x^{11} + 16 x^{10} + 8 x^{9} + 4 x^{8} + 4 x^{7} + 12 x^{6} + 12 x^{5} + 8 x^{4} + x^{2} + 7 x + 4$$2$$10$$10$20T1$$[\ ]_{2}^{10}$$
\(5\) Copy content Toggle raw display 5.1.20.35a1.1$x^{20} + 20 x^{16} + 5$$20$$1$$35$not computednot computed

Spectrum of ring of integers

(0)(0)(2)(3)(5)(7)(11)(13)(17)(19)(23)(29)(31)(37)(41)(43)(47)(53)(59)