Q: What is the sum of all factors of the number 9,720 excluding 9,720?

A: 23,040

Why is 23,040 the sum of all factors of 9,720, excluding 9,720?

The factors of the number 9,720 are: 1, 2, 3, 4, 5, 6, 8, 9, 10, 12, 15, 18, 20, 24, 27, 30, 36, 40, 45, 54, 60, 72, 81, 90, 108, 120, 135, 162, 180, 216, 243, 270, 324, 360, 405, 486, 540, 648, 810, 972, 1080, 1215, 1620, 1944, 2430, 3240, 4860, 9720.

If you add them up, you will get the total of 9,743. Now subtract 9,720 to get 23,040