general_fact: 20543 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 20543 is an unremarkable number.
trivia: 20543 is an unremarkable number.
historical_date: March 29th is the day in 1999 that the Dow Jones Industrial Average closes above the 10,000 mark (10,006.78) for the first time, during the height of the internet boom.