Fatto generale: 56720 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 56720 is an unremarkable number.
Trivia: 56720 is an uninteresting number.
Data storica: April 17th is the day in 1984 that Police Constable Yvonne Fletcher is killed by gunfire from the Libyan People's Bureau in London during a small demonstration outside the embassy.