Fatto generale: 20568 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 20568 is a boring number.
Trivia: 20568 is an unremarkable number.
Data storica: April 23rd is the day in 215 BC that a temple is built on the Capitoline Hill dedicated to Venus Erycina to commemorate the Roman defeat at Lake Trasimene.