Fait général: 20711 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 20711 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Culture générale: 20711 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Date historique: September 13th is the day in 1504 that Queen Isabella and King Ferdinand issue a Royal Warrant for the construction of a Royal Chapel (Capilla Real) to be built.