\\ Pari/GP code for working with number field 20.0.78148390643938933109518475030237312085224587264.1.
\\ 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 + 96*y^18 + 122*y^17 + 4620*y^16 + 18596*y^15 + 184045*y^14 + 728624*y^13 + 6000753*y^12 + 13556428*y^11 + 139124895*y^10 + 136683460*y^9 + 2117576320*y^8 - 289614572*y^7 + 18977386826*y^6 - 37574492902*y^5 + 70623059201*y^4 - 324133328144*y^3 + 72454618799*y^2 - 66338130030*y + 1082598671174, 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 - 4*x^19 + 96*x^18 + 122*x^17 + 4620*x^16 + 18596*x^15 + 184045*x^14 + 728624*x^13 + 6000753*x^12 + 13556428*x^11 + 139124895*x^10 + 136683460*x^9 + 2117576320*x^8 - 289614572*x^7 + 18977386826*x^6 - 37574492902*x^5 + 70623059201*x^4 - 324133328144*x^3 + 72454618799*x^2 - 66338130030*x + 1082598671174, 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]])