23

This number is a prime.

Just showing those entries submitted by 'Harrison': (Click here to show all)

sod(M22 exponent) = sod(M28 exponent) = sod(M37 exponent) = 23. [Harrison]

The classical Latin alphabet comprised 23 letters. [Harrison]

The two Voyager spacecraft use 23-watt radios. [Harrison]

(There are 10 curios for this number that have not yet been approved by an editor.)