// Magma code for working with number field 20.0.4141864704128763454804479176602577540516903124992.1.
// Some of these functions may take a long time to execute (this depends on the field).


// Define the number field: 
R<x> := PolynomialRing(Rationals()); K<a> := NumberField(x^20 - 4*x^19 + 177*x^18 - 4*x^17 + 8449*x^16 + 23822*x^15 + 168540*x^14 + 596526*x^13 + 2612317*x^12 + 7067238*x^11 + 38130743*x^10 + 75736410*x^9 + 321304814*x^8 + 864149074*x^7 + 1787066994*x^6 + 245640690*x^5 + 6843858589*x^4 - 4594563420*x^3 + 14977761454*x^2 - 24323038390*x + 15554125329);

// Defining polynomial: 
DefiningPolynomial(K);

// Degree over Q: 
Degree(K);

// Signature: 
Signature(K);

// Discriminant: 
OK := Integers(K); Discriminant(OK);

// Ramified primes: 
PrimeDivisors(Discriminant(OK));

// Automorphisms: 
Automorphisms(K);

// Integral basis: 
IntegralBasis(K);

// Class group: 
ClassGroup(K);

// Narrow class group: 
NarrowClassGroup(K);

// Unit group: 
UK, fUK := UnitGroup(K);

// Unit rank: 
UnitRank(K);

// Generator for roots of unity: 
K!f(TU.1) where TU,f is TorsionUnitGroup(K);

// Fundamental units: 
[K|fUK(g): g in Generators(UK)];

// Regulator: 
Regulator(K);

// Analytic class number formula: 
/* self-contained Magma code snippet to compute the analytic class number formula */
Qx<x> := PolynomialRing(Rationals()); K<a> := NumberField(x^20 - 4*x^19 + 177*x^18 - 4*x^17 + 8449*x^16 + 23822*x^15 + 168540*x^14 + 596526*x^13 + 2612317*x^12 + 7067238*x^11 + 38130743*x^10 + 75736410*x^9 + 321304814*x^8 + 864149074*x^7 + 1787066994*x^6 + 245640690*x^5 + 6843858589*x^4 - 4594563420*x^3 + 14977761454*x^2 - 24323038390*x + 15554125329);
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)));

// Intermediate fields: 
L := Subfields(K); L[2..#L];

// Galois group: 
G = GaloisGroup(K);

// Frobenius cycle types: 
// 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))];