Fontana Factorials

Todd Southworth, a newcomer to Road Sign Math, found this mathematically significant road sign a number of times on his way home. However, until he visited this site he didn't appreciate the wonderful math contained inside it.



A couple of factorials bring this set of numbers together in an elegant way.

$$20 \times (\sqrt{9})! = 5!$$

This sign is on eastbound CA-210 just east of I-15 in Fontana, California.