General fact: 20251 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Mathematical fact: 20251 is a boring number.
Trivia: 20251 is an unremarkable number.
Historical date: June 11th is the day in 1956 that Start of Gal Oya riots, the first reported ethnic riots that target minority Sri Lankan Tamils in the Eastern Province.