General fact: 20687 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Mathematical fact: 20687 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Trivia: 20687 is an uninteresting number.
Historical date: August 20th is the day in 1775 that the Spanish establish the Presidio San Augustin del Tucson in the town that became Tucson, Arizona.