\\ Pari/GP code for working with number field 20.0.10675123826048640000000000000000000000000000000000.12.
\\ Some of these functions may take a long time to execute (this depends on the field).


\\ Define the number field: 
K = bnfinit(y^20 + 40*y^18 - 20*y^17 + 1805*y^16 - 44*y^15 + 64390*y^14 + 29080*y^13 + 1829830*y^12 + 1333680*y^11 + 39756432*y^10 + 27516620*y^9 + 654022215*y^8 + 361124040*y^7 + 7909442290*y^6 + 3111251244*y^5 + 66433466785*y^4 + 18422918540*y^3 + 353939485660*y^2 + 67569922460*y + 907898452801, 1)

\\ Defining polynomial: 
K.pol

\\ Degree over Q: 
poldegree(K.pol)

\\ Signature: 
K.sign

\\ Discriminant: 
K.disc

\\ Ramified primes: 
factor(abs(K.disc))[,1]~

\\ Integral basis: 
K.zk

\\ Class group: 
K.clgp

\\ Narrow class group: 
bnfnarrow(K)

\\ Unit rank: 
K.fu

\\ Generator for roots of unity: 
K.tu[2]

\\ Fundamental units: 
K.fu

\\ Regulator: 
K.reg

\\ Analytic class number formula: 
\\ self-contained Pari/GP code snippet to compute the analytic class number formula
K = bnfinit(x^20 + 40*x^18 - 20*x^17 + 1805*x^16 - 44*x^15 + 64390*x^14 + 29080*x^13 + 1829830*x^12 + 1333680*x^11 + 39756432*x^10 + 27516620*x^9 + 654022215*x^8 + 361124040*x^7 + 7909442290*x^6 + 3111251244*x^5 + 66433466785*x^4 + 18422918540*x^3 + 353939485660*x^2 + 67569922460*x + 907898452801, 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)))]

\\ Intermediate fields: 
L = nfsubfields(K); L[2..length(L)]

\\ Galois group: 
polgalois(K.pol)

\\ Frobenius cycle types: 
\\ 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]])