Q: What is the sum of all factors of the number 87,720 excluding 87,720?

A: 197,400

Why is 197,400 the sum of all factors of 87,720, excluding 87,720?

The factors of the number 87,720 are: 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 17, 20, 24, 30, 34, 40, 43, 51, 60, 68, 85, 86, 102, 120, 129, 136, 170, 172, 204, 215, 255, 258, 340, 344, 408, 430, 510, 516, 645, 680, 731, 860, 1020, 1032, 1290, 1462, 1720, 2040, 2193, 2580, 2924, 3655, 4386, 5160, 5848, 7310, 8772, 10965, 14620, 17544, 21930, 29240, 43860, 87720.

If you add them up, you will get the total of 87,917. Now subtract 87,720 to get 197,400