General fact: 20129 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Mathematical fact: 20129 is an uninteresting number.
Trivia: 20129 is an uninteresting number.
Historical date: February 9th is the day in 1889 that President Grover Cleveland signs a bill elevating the United States Department of Agriculture to a Cabinet-level agency.