Fait général: 2920 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 2920 is a heptagonal pyramidal number.
Culture générale: 2920 is a boring number.
Date historique: December 29th is the day in 1937 that the Irish Free State is replaced by a new state called Ireland with the adoption of a new constitution.