general_fact: 20514 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 20514 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
trivia: 20514 is an unremarkable number.
historical_date: February 29th is the day in 1712 that February 29 is followed by February 30 in Sweden, in a move to abolish the Swedish calendar for a return to the Old style.