Fait mathématique: 20739 is an unremarkable number.
Culture générale: 20739 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Date historique: October 11th is the day in 1982 that the Mary Rose, a Tudor carrack which sank on July 19, 1545, is salvaged from the sea bed of the Solent, off Portsmouth.