Q: What is the sum of all factors of the number 405,480 excluding 405,480?

A: 861,720

Why is 861,720 the sum of all factors of 405,480, excluding 405,480?

The factors of the number 405,480 are: 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 20, 24, 30, 31, 40, 60, 62, 93, 109, 120, 124, 155, 186, 218, 248, 310, 327, 372, 436, 465, 545, 620, 654, 744, 872, 930, 1090, 1240, 1308, 1635, 1860, 2180, 2616, 3270, 3379, 3720, 4360, 6540, 6758, 10137, 13080, 13516, 16895, 20274, 27032, 33790, 40548, 50685, 67580, 81096, 101370, 135160, 202740, 405480.

If you add them up, you will get the total of 406,341. Now subtract 405,480 to get 861,720