general_fact: 20471 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 20471 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
trivia: 20471 is an uninteresting number.
historical_date: January 17th is the day in 1608 that Emperor Susenyos of Ethiopia surprises an Oromo army at Ebenat; his army reportedly kills 12,000 Oromo at the cost of 400 men.