general_fact: 20384 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 20384 is a boring number.
trivia: 20384 is a boring number.
historical_date: October 22nd is the day in 1910 that Dr. Crippen is convicted at the Old Bailey of poisoning his wife and is subsequently hanged at Pentonville Prison in London.