Q: What is the sum of all factors of the number 39,780 excluding 39,780?

 A: 97,812

Why is 97,812 the sum of all factors of 39,780, excluding 39,780?

The factors of the number 39,780 are: 1, 2, 3, 4, 5, 6, 9, 10, 12, 13, 15, 17, 18, 20, 26, 30, 34, 36, 39, 45, 51, 52, 60, 65, 68, 78, 85, 90, 102, 117, 130, 153, 156, 170, 180, 195, 204, 221, 234, 255, 260, 306, 340, 390, 442, 468, 510, 585, 612, 663, 765, 780, 884, 1020, 1105, 1170, 1326, 1530, 1989, 2210, 2340, 2652, 3060, 3315, 3978, 4420, 6630, 7956, 9945, 13260, 19890, 39780.

If you add them up, you will get the total of 39,877. Now subtract 39,780 to get 97,812


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