general_fact: 6320 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 6320 is the Entringer number E(8,4).
trivia: 6320 is an unremarkable number.
historical_date: April 20th is the day in 2008 that Danica Patrick wins the Indy Japan 300 becoming the first female driver in history to win an Indy car race.