Q: What is the sum of all factors of the number 12,240 excluding 12,240?

A: 31,284

Why is 31,284 the sum of all factors of 12,240, excluding 12,240?

The factors of the number 12,240 are: 1, 2, 3, 4, 5, 6, 8, 9, 10, 12, 15, 16, 17, 18, 20, 24, 30, 34, 36, 40, 45, 48, 51, 60, 68, 72, 80, 85, 90, 102, 120, 136, 144, 153, 170, 180, 204, 240, 255, 272, 306, 340, 360, 408, 510, 612, 680, 720, 765, 816, 1020, 1224, 1360, 1530, 2040, 2448, 3060, 4080, 6120, 12240.

If you add them up, you will get the total of 12,271. Now subtract 12,240 to get 31,284