general_fact: 19933 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 19933 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
trivia: 19933 is a boring number.
historical_date: July 28th is the day in 1932 that U.S. President Herbert Hoover orders the United States Army to forcibly evict the "Bonus Army" of World War I veterans gathered in Washington, D.C.