# Properties

 Label 20.0.12453009040...3125.1 Degree $20$ Signature $[0, 10]$ Discriminant $3^{4}\cdot 5^{17}\cdot 67^{4}$ Root discriminant $11.34$ Ramified primes $3, 5, 67$ Class number $1$ Class group Trivial Galois Group $C_4\times S_5$ (as 20T123)

# Related objects

Show commands for: Magma / SageMath / Pari/GP

magma: R<x> := PolynomialRing(Rationals()); K<a> := NumberField(R![1, 1, 2, 3, 6, -10, -1, -6, 2, -8, 12, -3, 5, -4, 5, -5, 2, -2, 1, -1, 1]);
sage: x = polygen(QQ); K.<a> = NumberField(x^20 - x^19 + x^18 - 2*x^17 + 2*x^16 - 5*x^15 + 5*x^14 - 4*x^13 + 5*x^12 - 3*x^11 + 12*x^10 - 8*x^9 + 2*x^8 - 6*x^7 - x^6 - 10*x^5 + 6*x^4 + 3*x^3 + 2*x^2 + x + 1)
gp: K = bnfinit(x^20 - x^19 + x^18 - 2*x^17 + 2*x^16 - 5*x^15 + 5*x^14 - 4*x^13 + 5*x^12 - 3*x^11 + 12*x^10 - 8*x^9 + 2*x^8 - 6*x^7 - x^6 - 10*x^5 + 6*x^4 + 3*x^3 + 2*x^2 + x + 1, 1)

## Normalizeddefining polynomial

$$x^{20}$$ $$\mathstrut -\mathstrut x^{19}$$ $$\mathstrut +\mathstrut x^{18}$$ $$\mathstrut -\mathstrut 2 x^{17}$$ $$\mathstrut +\mathstrut 2 x^{16}$$ $$\mathstrut -\mathstrut 5 x^{15}$$ $$\mathstrut +\mathstrut 5 x^{14}$$ $$\mathstrut -\mathstrut 4 x^{13}$$ $$\mathstrut +\mathstrut 5 x^{12}$$ $$\mathstrut -\mathstrut 3 x^{11}$$ $$\mathstrut +\mathstrut 12 x^{10}$$ $$\mathstrut -\mathstrut 8 x^{9}$$ $$\mathstrut +\mathstrut 2 x^{8}$$ $$\mathstrut -\mathstrut 6 x^{7}$$ $$\mathstrut -\mathstrut x^{6}$$ $$\mathstrut -\mathstrut 10 x^{5}$$ $$\mathstrut +\mathstrut 6 x^{4}$$ $$\mathstrut +\mathstrut 3 x^{3}$$ $$\mathstrut +\mathstrut 2 x^{2}$$ $$\mathstrut +\mathstrut x$$ $$\mathstrut +\mathstrut 1$$

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

## Invariants

 Degree: $20$ magma: Degree(K); sage: K.degree() gp: poldegree(K.pol) Signature: $[0, 10]$ magma: Signature(K); sage: K.signature() gp: K.sign Discriminant: $$1245300904083251953125=3^{4}\cdot 5^{17}\cdot 67^{4}$$ magma: Discriminant(K); sage: K.disc() gp: K.disc Root discriminant: $11.34$ magma: Abs(Discriminant(K))^(1/Degree(K)); sage: (K.disc().abs())^(1./K.degree()) gp: abs(K.disc)^(1/poldegree(K.pol)) Ramified primes: $3, 5, 67$ magma: PrimeDivisors(Discriminant(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 $$a$$)

$1$, $a$, $a^{2}$, $a^{3}$, $a^{4}$, $a^{5}$, $a^{6}$, $a^{7}$, $a^{8}$, $a^{9}$, $a^{10}$, $a^{11}$, $\frac{1}{5} a^{12} - \frac{2}{5} a^{11} + \frac{1}{5} a^{10} - \frac{2}{5} a^{9} - \frac{2}{5} a^{8} + \frac{1}{5} a^{7} + \frac{1}{5} a^{6} + \frac{2}{5} a^{5} + \frac{2}{5} a^{4} - \frac{1}{5} a^{3} + \frac{2}{5} a^{2} + \frac{2}{5} a + \frac{1}{5}$, $\frac{1}{5} a^{13} + \frac{2}{5} a^{11} - \frac{1}{5} a^{9} + \frac{2}{5} a^{8} - \frac{2}{5} a^{7} - \frac{1}{5} a^{6} + \frac{1}{5} a^{5} - \frac{2}{5} a^{4} + \frac{1}{5} a^{2} + \frac{2}{5}$, $\frac{1}{5} a^{14} - \frac{1}{5} a^{11} + \frac{2}{5} a^{10} + \frac{1}{5} a^{9} + \frac{2}{5} a^{8} + \frac{2}{5} a^{7} - \frac{1}{5} a^{6} - \frac{1}{5} a^{5} + \frac{1}{5} a^{4} - \frac{2}{5} a^{3} + \frac{1}{5} a^{2} - \frac{2}{5} a - \frac{2}{5}$, $\frac{1}{5} a^{15} + \frac{2}{5} a^{10} - \frac{2}{5} a^{5} + \frac{1}{5}$, $\frac{1}{25} a^{16} + \frac{1}{25} a^{15} - \frac{1}{25} a^{14} - \frac{2}{25} a^{12} - \frac{8}{25} a^{11} - \frac{12}{25} a^{10} - \frac{12}{25} a^{9} - \frac{3}{25} a^{8} - \frac{4}{25} a^{7} + \frac{12}{25} a^{6} - \frac{1}{5} a^{4} - \frac{6}{25} a^{3} - \frac{2}{5} a^{2} + \frac{4}{25} a + \frac{11}{25}$, $\frac{1}{25} a^{17} - \frac{2}{25} a^{15} + \frac{1}{25} a^{14} - \frac{2}{25} a^{13} - \frac{1}{25} a^{12} + \frac{11}{25} a^{11} + \frac{1}{5} a^{10} - \frac{1}{25} a^{9} - \frac{11}{25} a^{8} - \frac{4}{25} a^{7} - \frac{7}{25} a^{6} + \frac{1}{5} a^{5} + \frac{9}{25} a^{4} - \frac{9}{25} a^{3} - \frac{1}{25} a^{2} - \frac{8}{25} a - \frac{6}{25}$, $\frac{1}{25} a^{18} - \frac{2}{25} a^{15} + \frac{1}{25} a^{14} - \frac{1}{25} a^{13} + \frac{2}{25} a^{12} - \frac{6}{25} a^{11} - \frac{1}{5} a^{10} + \frac{1}{5} a^{9} + \frac{2}{5} a^{8} - \frac{2}{5} a^{7} - \frac{6}{25} a^{6} + \frac{4}{25} a^{5} + \frac{1}{25} a^{4} + \frac{7}{25} a^{3} - \frac{8}{25} a^{2} + \frac{7}{25} a + \frac{2}{25}$, $\frac{1}{25} a^{19} - \frac{2}{25} a^{15} + \frac{2}{25} a^{14} + \frac{2}{25} a^{13} + \frac{4}{25} a^{11} - \frac{9}{25} a^{10} - \frac{4}{25} a^{9} - \frac{1}{25} a^{8} + \frac{6}{25} a^{7} + \frac{8}{25} a^{6} + \frac{1}{25} a^{5} - \frac{3}{25} a^{4} + \frac{2}{5} a^{3} + \frac{12}{25} a^{2} - \frac{1}{5} a - \frac{8}{25}$

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

## Class group and class number

Trivial Abelian group, order $1$

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

## Unit group

magma: UK, f := UnitGroup(K);
sage: UK = K.unit_group()
 Rank: $9$ magma: UnitRank(K); sage: UK.rank() gp: K.fu Torsion generator: $$-\frac{8}{25} a^{19} + \frac{4}{25} a^{17} + \frac{8}{25} a^{15} + \frac{8}{25} a^{14} + \frac{16}{25} a^{13} - \frac{34}{25} a^{12} + \frac{32}{25} a^{11} - \frac{48}{25} a^{10} - \frac{32}{25} a^{9} - \frac{56}{25} a^{8} + \frac{91}{25} a^{7} - \frac{32}{25} a^{6} + \frac{72}{25} a^{5} + \frac{8}{5} a^{4} + \frac{24}{25} a^{3} - 3 a^{2} + \frac{8}{25} a$$ (order $10$) magma: K!f(TU.1) where TU,f is TorsionUnitGroup(K); sage: UK.torsion_generator() gp: K.tu[2] Fundamental units: $$\frac{1}{5} a^{19} - \frac{1}{5} a^{15} - \frac{1}{5} a^{14} - \frac{2}{5} a^{13} + \frac{4}{5} a^{12} - \frac{4}{5} a^{11} + \frac{6}{5} a^{10} + \frac{4}{5} a^{9} + \frac{7}{5} a^{8} - \frac{8}{5} a^{7} + \frac{4}{5} a^{6} - \frac{9}{5} a^{5} - a^{4} - \frac{3}{5} a^{3} + \frac{8}{5} a^{2} - \frac{1}{5} a$$,  $$\frac{4}{25} a^{18} - \frac{8}{25} a^{17} + \frac{8}{25} a^{16} - \frac{9}{25} a^{15} + \frac{13}{25} a^{14} - \frac{28}{25} a^{13} + \frac{8}{5} a^{12} - \frac{36}{25} a^{11} + \frac{34}{25} a^{10} - \frac{33}{25} a^{9} + \frac{69}{25} a^{8} - \frac{19}{5} a^{7} + \frac{58}{25} a^{6} - \frac{34}{25} a^{5} + \frac{27}{25} a^{4} - \frac{63}{25} a^{3} + \frac{86}{25} a^{2} - \frac{21}{25} a + \frac{4}{25}$$,  $$\frac{4}{25} a^{19} - \frac{3}{25} a^{18} - \frac{1}{25} a^{17} - \frac{7}{25} a^{16} + \frac{3}{25} a^{15} - \frac{14}{25} a^{14} + \frac{13}{25} a^{13} + \frac{4}{25} a^{12} + \frac{14}{25} a^{11} - \frac{2}{25} a^{10} + \frac{39}{25} a^{9} - \frac{17}{25} a^{8} - \frac{44}{25} a^{7} - \frac{32}{25} a^{6} - \frac{18}{25} a^{5} - \frac{24}{25} a^{4} + a^{3} + \frac{83}{25} a^{2} + \frac{29}{25} a - \frac{4}{25}$$,  $$\frac{13}{25} a^{19} - \frac{17}{25} a^{18} + \frac{13}{25} a^{17} - \frac{21}{25} a^{16} + \frac{26}{25} a^{15} - \frac{57}{25} a^{14} + \frac{67}{25} a^{13} - \frac{8}{5} a^{12} + \frac{7}{5} a^{11} - \frac{4}{5} a^{10} + \frac{122}{25} a^{9} - \frac{118}{25} a^{8} - \frac{1}{5} a^{7} + \frac{3}{25} a^{6} - \frac{3}{5} a^{5} - \frac{79}{25} a^{4} + \frac{21}{5} a^{3} + \frac{44}{25} a^{2} - \frac{42}{25} a - \frac{17}{25}$$,  $$\frac{1}{5} a^{19} - \frac{1}{5} a^{18} + \frac{1}{5} a^{17} - \frac{2}{5} a^{16} + \frac{3}{5} a^{15} - a^{14} + a^{13} - \frac{4}{5} a^{12} + \frac{4}{5} a^{11} - \frac{4}{5} a^{10} + \frac{11}{5} a^{9} - \frac{6}{5} a^{8} - \frac{1}{5} a^{7} - \frac{2}{5} a^{6} + \frac{6}{5} a^{5} - \frac{7}{5} a^{4} + \frac{4}{5} a^{3} + \frac{4}{5} a^{2} - a - 1$$,  $$\frac{16}{25} a^{19} - \frac{12}{25} a^{18} + \frac{12}{25} a^{17} - \frac{29}{25} a^{16} + \frac{24}{25} a^{15} - \frac{69}{25} a^{14} + \frac{12}{5} a^{13} - \frac{43}{25} a^{12} + \frac{13}{5} a^{11} - \frac{31}{25} a^{10} + \frac{172}{25} a^{9} - \frac{81}{25} a^{8} + \frac{4}{25} a^{7} - \frac{107}{25} a^{6} - \frac{27}{25} a^{5} - \frac{147}{25} a^{4} + \frac{67}{25} a^{3} + \frac{71}{25} a^{2} + \frac{54}{25} a - \frac{8}{25}$$,  $$\frac{8}{25} a^{19} - \frac{12}{25} a^{18} + \frac{8}{25} a^{17} - \frac{4}{5} a^{16} + \frac{22}{25} a^{15} - \frac{48}{25} a^{14} + \frac{62}{25} a^{13} - \frac{42}{25} a^{12} + \frac{57}{25} a^{11} - \frac{42}{25} a^{10} + \frac{22}{5} a^{9} - \frac{116}{25} a^{8} + \frac{6}{25} a^{7} - \frac{11}{5} a^{6} + \frac{1}{5} a^{5} - \frac{69}{25} a^{4} + \frac{104}{25} a^{3} + \frac{54}{25} a^{2} - \frac{8}{25} a + \frac{4}{25}$$,  $$\frac{8}{25} a^{19} - \frac{12}{25} a^{18} + \frac{8}{25} a^{17} - \frac{17}{25} a^{16} + \frac{4}{5} a^{15} - \frac{41}{25} a^{14} + \frac{57}{25} a^{13} - \frac{38}{25} a^{12} + \frac{43}{25} a^{11} - \frac{33}{25} a^{10} + \frac{94}{25} a^{9} - \frac{22}{5} a^{8} + \frac{9}{25} a^{7} - \frac{39}{25} a^{6} - \frac{1}{5} a^{5} - \frac{44}{25} a^{4} + \frac{106}{25} a^{3} + \frac{24}{25} a^{2} - \frac{21}{25} a + \frac{12}{25}$$,  $$\frac{4}{25} a^{19} - \frac{8}{25} a^{18} + \frac{16}{25} a^{17} - \frac{21}{25} a^{16} + a^{15} - \frac{38}{25} a^{14} + \frac{49}{25} a^{13} - \frac{13}{5} a^{12} + \frac{63}{25} a^{11} - \frac{49}{25} a^{10} + \frac{13}{5} a^{9} - \frac{67}{25} a^{8} + \frac{94}{25} a^{7} - \frac{74}{25} a^{6} + \frac{27}{25} a^{5} - \frac{26}{25} a^{4} + \frac{16}{25} a^{3} - \frac{54}{25} a^{2} + \frac{37}{25} a$$ magma: [K!f(g): g in Generators(UK)]; sage: UK.fundamental_units() gp: K.fu Regulator: $$676.304774$$ magma: Regulator(K); sage: K.regulator() gp: K.reg

## Galois group

magma: GaloisGroup(K);
sage: K.galois_group(type='pari')
gp: polgalois(K.pol)
 A non-solvable group of order 480 The 28 conjugacy class representatives for $C_4\times S_5$ Character table for $C_4\times S_5$ is not computed

## Intermediate fields

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

## Sibling fields

 Degree 20 sibling: data not computed Degree 24 siblings: data not computed Degree 40 siblings: data not computed

## Frobenius cycle types

 $p$ Cycle type 2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 $20$ R R ${\href{/LocalNumberField/7.12.0.1}{12} }{,}\,{\href{/LocalNumberField/7.4.0.1}{4} }^{2}$ ${\href{/LocalNumberField/11.5.0.1}{5} }^{4}$ ${\href{/LocalNumberField/13.4.0.1}{4} }^{5}$ ${\href{/LocalNumberField/17.4.0.1}{4} }^{5}$ ${\href{/LocalNumberField/19.10.0.1}{10} }^{2}$ ${\href{/LocalNumberField/23.4.0.1}{4} }^{5}$ ${\href{/LocalNumberField/29.4.0.1}{4} }^{4}{,}\,{\href{/LocalNumberField/29.2.0.1}{2} }^{2}$ ${\href{/LocalNumberField/31.3.0.1}{3} }^{4}{,}\,{\href{/LocalNumberField/31.2.0.1}{2} }^{4}$ $20$ ${\href{/LocalNumberField/41.5.0.1}{5} }^{4}$ ${\href{/LocalNumberField/43.4.0.1}{4} }^{5}$ ${\href{/LocalNumberField/47.4.0.1}{4} }^{5}$ ${\href{/LocalNumberField/53.12.0.1}{12} }{,}\,{\href{/LocalNumberField/53.4.0.1}{4} }^{2}$ ${\href{/LocalNumberField/59.4.0.1}{4} }^{4}{,}\,{\href{/LocalNumberField/59.2.0.1}{2} }^{2}$

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
$3$3.8.4.1$x^{8} + 36 x^{4} - 27 x^{2} + 324$$2$$4$$4$$C_4\times C_2$$[\ ]_{2}^{4} 3.12.0.1x^{12} - x^{4} - x^{3} - x^{2} + x - 1$$1$$12$$0$$C_{12}$$[\ ]^{12}$
$5$5.8.6.1$x^{8} - 5 x^{4} + 400$$4$$2$$6$$C_4\times C_2$$[\ ]_{4}^{2} 5.12.11.2x^{12} - 20$$12$$1$$11$$S_3 \times C_4$$[\ ]_{12}^{2}$
$67$67.4.0.1$x^{4} - x + 2$$1$$4$$0$$C_4$$[\ ]^{4} 67.4.0.1x^{4} - x + 2$$1$$4$$0$$C_4$$[\ ]^{4}$
67.4.0.1$x^{4} - x + 2$$1$$4$$0$$C_4$$[\ ]^{4} 67.8.4.1x^{8} + 17956 x^{4} - 300763 x^{2} + 80604484$$2$$4$$4$$C_4\times C_2$$[\ ]_{2}^{4}$