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Properties

Label 20.6.68462844235...0000.4
Degree $20$
Signature $[6, 7]$
Discriminant $-\,2^{20}\cdot 5^{10}\cdot 401^{8}$
Root discriminant $49.18$
Ramified primes $2, 5, 401$
Class number $1$ (GRH)
Class group Trivial (GRH)
Galois group 20T525

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Show commands for: Magma / SageMath / Pari/GP

magma: R<x> := PolynomialRing(Rationals()); K<a> := NumberField(R![-81, 0, -522, 0, -760, 0, 567, 0, 1525, 0, 181, 0, -702, 0, -237, 0, 31, 0, 16, 0, 1]);
 
sage: x = polygen(QQ); K.<a> = NumberField(x^20 + 16*x^18 + 31*x^16 - 237*x^14 - 702*x^12 + 181*x^10 + 1525*x^8 + 567*x^6 - 760*x^4 - 522*x^2 - 81)
 
gp: K = bnfinit(x^20 + 16*x^18 + 31*x^16 - 237*x^14 - 702*x^12 + 181*x^10 + 1525*x^8 + 567*x^6 - 760*x^4 - 522*x^2 - 81, 1)
 

Normalized defining polynomial

\( x^{20} + 16 x^{18} + 31 x^{16} - 237 x^{14} - 702 x^{12} + 181 x^{10} + 1525 x^{8} + 567 x^{6} - 760 x^{4} - 522 x^{2} - 81 \)

magma: DefiningPolynomial(K);
 
sage: K.defining_polynomial()
 
gp: K.pol
 

Invariants

Degree:  $20$
magma: Degree(K);
 
sage: K.degree()
 
gp: poldegree(K.pol)
 
Signature:  $[6, 7]$
magma: Signature(K);
 
sage: K.signature()
 
gp: K.sign
 
Discriminant:  \(-6846284423532426067978240000000000=-\,2^{20}\cdot 5^{10}\cdot 401^{8}\)
magma: Discriminant(Integers(K));
 
sage: K.disc()
 
gp: K.disc
 
Root discriminant:  $49.18$
magma: Abs(Discriminant(Integers(K)))^(1/Degree(K));
 
sage: (K.disc().abs())^(1./K.degree())
 
gp: abs(K.disc)^(1/poldegree(K.pol))
 
Ramified primes:  $2, 5, 401$
magma: PrimeDivisors(Discriminant(Integers(K)));
 
sage: K.disc().support()
 
gp: factor(abs(K.disc))[,1]~
 
This field is not Galois over $\Q$.
This is not a CM field.

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

$1$, $a$, $a^{2}$, $a^{3}$, $a^{4}$, $a^{5}$, $a^{6}$, $a^{7}$, $a^{8}$, $a^{9}$, $a^{10}$, $\frac{1}{3} a^{11} + \frac{1}{3} a^{9} + \frac{1}{3} a^{3} + \frac{1}{3} a$, $\frac{1}{3} a^{12} + \frac{1}{3} a^{10} + \frac{1}{3} a^{4} + \frac{1}{3} a^{2}$, $\frac{1}{3} a^{13} - \frac{1}{3} a^{9} + \frac{1}{3} a^{5} - \frac{1}{3} a$, $\frac{1}{9} a^{14} - \frac{1}{9} a^{12} + \frac{1}{9} a^{10} - \frac{2}{9} a^{6} - \frac{1}{9} a^{4} - \frac{2}{9} a^{2}$, $\frac{1}{9} a^{15} - \frac{1}{9} a^{13} + \frac{1}{9} a^{11} - \frac{2}{9} a^{7} - \frac{1}{9} a^{5} - \frac{2}{9} a^{3}$, $\frac{1}{171} a^{16} - \frac{1}{57} a^{14} - \frac{4}{57} a^{12} + \frac{82}{171} a^{10} + \frac{61}{171} a^{8} + \frac{25}{57} a^{6} - \frac{5}{57} a^{4} - \frac{74}{171} a^{2} + \frac{2}{19}$, $\frac{1}{171} a^{17} - \frac{1}{57} a^{15} - \frac{4}{57} a^{13} + \frac{25}{171} a^{11} + \frac{4}{171} a^{9} + \frac{25}{57} a^{7} - \frac{5}{57} a^{5} + \frac{40}{171} a^{3} - \frac{13}{57} a$, $\frac{1}{3285289449} a^{18} - \frac{3762047}{3285289449} a^{16} + \frac{69301138}{3285289449} a^{14} + \frac{32607047}{1095096483} a^{12} + \frac{37455733}{365032161} a^{10} + \frac{1169300008}{3285289449} a^{8} + \frac{1623080596}{3285289449} a^{6} - \frac{19875461}{121677387} a^{4} - \frac{1083764497}{3285289449} a^{2} - \frac{102493802}{365032161}$, $\frac{1}{9855868347} a^{19} - \frac{3762047}{9855868347} a^{17} + \frac{434333299}{9855868347} a^{15} - \frac{454102501}{3285289449} a^{13} - \frac{14554175}{365032161} a^{11} + \frac{1169300008}{9855868347} a^{9} + \frac{4178305723}{9855868347} a^{7} - \frac{221862899}{1095096483} a^{5} - \frac{2908925302}{9855868347} a^{3} + \frac{262538359}{1095096483} a$

magma: IntegralBasis(K);
 
sage: K.integral_basis()
 
gp: K.zk
 

Class group and class number

Trivial group, which has order $1$ (assuming GRH)

magma: ClassGroup(K);
 
sage: K.class_group().invariants()
 
gp: K.clgp
 

Unit group

magma: UK, f := UnitGroup(K);
 
sage: UK = K.unit_group()
 
Rank:  $12$
magma: UnitRank(K);
 
sage: UK.rank()
 
gp: K.fu
 
Torsion generator:  \( -1 \) (order $2$)
magma: K!f(TU.1) where TU,f is TorsionUnitGroup(K);
 
sage: UK.torsion_generator()
 
gp: K.tu[2]
 
Fundamental units:  Units are too long to display, but can be downloaded with other data for this field from 'Stored data to gp' link to the right (assuming GRH)
magma: [K!f(g): g in Generators(UK)];
 
sage: UK.fundamental_units()
 
gp: K.fu
 
Regulator:  \( 2092883089.65 \) (assuming GRH)
magma: Regulator(K);
 
sage: K.regulator()
 
gp: K.reg
 

Galois group

20T525:

magma: GaloisGroup(K);
 
sage: K.galois_group(type='pari')
 
gp: polgalois(K.pol)
 
A solvable group of order 20480
The 152 conjugacy class representatives for t20n525 are not computed
Character table for t20n525 is not computed

Intermediate fields

\(\Q(\sqrt{5}) \), 5.5.160801.1, 10.10.80803005003125.1

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

Sibling fields

Degree 20 siblings: data not computed
Degree 40 siblings: data not computed

Frobenius cycle types

$p$ 2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59
Cycle type R ${\href{/LocalNumberField/3.4.0.1}{4} }^{3}{,}\,{\href{/LocalNumberField/3.2.0.1}{2} }^{4}$ R $20$ ${\href{/LocalNumberField/11.10.0.1}{10} }{,}\,{\href{/LocalNumberField/11.5.0.1}{5} }^{2}$ ${\href{/LocalNumberField/13.4.0.1}{4} }^{4}{,}\,{\href{/LocalNumberField/13.2.0.1}{2} }^{2}$ ${\href{/LocalNumberField/17.4.0.1}{4} }^{2}{,}\,{\href{/LocalNumberField/17.2.0.1}{2} }^{6}$ ${\href{/LocalNumberField/19.4.0.1}{4} }{,}\,{\href{/LocalNumberField/19.2.0.1}{2} }^{6}{,}\,{\href{/LocalNumberField/19.1.0.1}{1} }^{4}$ ${\href{/LocalNumberField/23.4.0.1}{4} }^{3}{,}\,{\href{/LocalNumberField/23.2.0.1}{2} }^{4}$ ${\href{/LocalNumberField/29.5.0.1}{5} }^{4}$ ${\href{/LocalNumberField/31.4.0.1}{4} }^{2}{,}\,{\href{/LocalNumberField/31.2.0.1}{2} }^{5}{,}\,{\href{/LocalNumberField/31.1.0.1}{1} }^{2}$ ${\href{/LocalNumberField/37.4.0.1}{4} }^{4}{,}\,{\href{/LocalNumberField/37.2.0.1}{2} }^{2}$ ${\href{/LocalNumberField/41.10.0.1}{10} }^{2}$ $20$ $20$ ${\href{/LocalNumberField/53.4.0.1}{4} }^{2}{,}\,{\href{/LocalNumberField/53.2.0.1}{2} }^{6}$ ${\href{/LocalNumberField/59.4.0.1}{4} }^{3}{,}\,{\href{/LocalNumberField/59.2.0.1}{2} }^{2}{,}\,{\href{/LocalNumberField/59.1.0.1}{1} }^{4}$

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

magma: p := 7; // to obtain a list of $[e_i,f_i]$ for the factorization of the ideal $p\mathcal{O}_K$:
 
magma: idealfactors := Factorization(p*Integers(K)); // get the data
 
magma: [<primefactor[2], Valuation(Norm(primefactor[1]), p)> : primefactor in idealfactors];
 
sage: p = 7; # to obtain a list of $[e_i,f_i]$ for the factorization of the ideal $p\mathcal{O}_K$:
 
sage: [(e, pr.norm().valuation(p)) for pr,e in K.factor(p)]
 
gp: p = 7; \\ to obtain a list of $[e_i,f_i]$ for the factorization of the ideal $p\mathcal{O}_K$:
 
gp: idealfactors = idealprimedec(K, p); \\ get the data
 
gp: vector(length(idealfactors), j, [idealfactors[j][3], idealfactors[j][4]])
 

Local algebras for ramified primes

$p$LabelPolynomial $e$ $f$ $c$ Galois group Slope content
2Data not computed
5Data not computed
401Data not computed