general_fact: 20003 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 20003 is an uninteresting number.
trivia: 20003 is a boring number.
historical_date: October 6th is the day in 1600 that Jacopo Peri's Euridice, the earliest surviving opera, receives its première performance in Florence, signifying the beginning of the Baroque Period.