General fact: 20259 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Mathematical fact: 20259 is a boring number.
Trivia: 20259 is an uninteresting number.
Historical date: June 19th is the day in 1862 that the U.S. Congress prohibits slavery in United States territories, nullifying Dred Scott v. Sandford.