Fatto generale: 20135 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 20135 is an unremarkable number.
Trivia: 20135 is an unremarkable number.
Data storica: February 15th is the day in 1979 that Don Dunstan resigns as Premier of South Australia, ending a decade of sweeping social liberalisation.