Q: What is the sum of all factors of the number 277,780 excluding 277,780?

A: 387,500

Why is 387,500 the sum of all factors of 277,780, excluding 277,780?

The factors of the number 277,780 are: 1, 2, 4, 5, 10, 17, 19, 20, 34, 38, 43, 68, 76, 85, 86, 95, 170, 172, 190, 215, 323, 340, 380, 430, 646, 731, 817, 860, 1292, 1462, 1615, 1634, 2924, 3230, 3268, 3655, 4085, 6460, 7310, 8170, 13889, 14620, 16340, 27778, 55556, 69445, 138890, 277780.

If you add them up, you will get the total of 278,167. Now subtract 277,780 to get 387,500