Fait général: 20557 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 20557 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Culture générale: 20557 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Date historique: April 12th is the day in 1820 that Alexander Ypsilantis is declared leader of Filiki Eteria, a secret organization to overthrow Ottoman rule over Greece.