Fait général: 20807 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 20807 is an unremarkable number.
Culture générale: 20807 is an unremarkable number.
Date historique: December 18th is the day in 2005 that the civil war in Chad begins when rebel groups, allegedly backed by neighbouring Sudan, launch an attack in Adré.