general_fact: 20565 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 20565 is an uninteresting number.
trivia: 20565 is an uninteresting number.
historical_date: April 20th is the day in 1770 that the Georgian king Erekle II, abandoned by his Russian ally Count Totleben, wins a victory over Ottoman forces at Aspindza.