Hecho general: 25420 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Hecho matemático: 25420 is an uninteresting number.
Trivia: 25420 is an uninteresting number.
Fecha histórica: August 5th is the day in 1925 that Plaid Cymru is formed with the aim of disseminating knowledge of the Welsh language that is at the time in danger of dying out.