\\ Pari/GP code for working with number field 20.20.8501150111111046013911040000000000.1

\\ Some of these functions may take a long time to execute (this depends on the field).

\\ Define the number field: 
K = bnfinit(y^20 - 4*y^19 - 33*y^18 + 120*y^17 + 468*y^16 - 1392*y^15 - 3799*y^14 + 8012*y^13 + 19008*y^12 - 23720*y^11 - 57969*y^10 + 31228*y^9 + 101057*y^8 - 964*y^7 - 86922*y^6 - 33928*y^5 + 22258*y^4 + 19672*y^3 + 5396*y^2 + 600*y + 20, 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

\\ 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 - 4*x^19 - 33*x^18 + 120*x^17 + 468*x^16 - 1392*x^15 - 3799*x^14 + 8012*x^13 + 19008*x^12 - 23720*x^11 - 57969*x^10 + 31228*x^9 + 101057*x^8 - 964*x^7 - 86922*x^6 - 33928*x^5 + 22258*x^4 + 19672*x^3 + 5396*x^2 + 600*x + 20, 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(b)]

\\ Galois group: 
polgalois(K.pol)

\\ Frobenius cycle types: 
\\ to obtain a list of $[e_i,f_i]$ for the factorization of the ideal $p\mathcal{O}_K$ for $p=7$ in Pari:
p = 7; pfac = idealprimedec(K, p); vector(length(pfac), j, [pfac[j][3], pfac[j][4]])