Fait général: 20940 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 20940 is an unremarkable number.
Culture générale: 20940 is an uninteresting number.
Date historique: April 30th is the day in 1006 that Supernova SN 1006, the brightest supernova in recorded history, appears in the constellation Lupus.