Fatto generale: 23 is the number of crosses on Calvary in the Monty Python film Life Of Brian.
Fatto matematico: 23 is the first prime P for which unique factorization of cyclotomic integers based on the Pth root of unity breaks down.
Trivia: 23 is the number of minutes that all flashbacks take place before the assassination attempt on the president in the film Vantage Point.
Data storica: January 23rd is the day in 1789 that Georgetown College, the first Catholic University in the United States, is founded in Georgetown, Maryland (now a part of Washington, D.C.).