Q: What is the sum of all factors of the number 9,780 excluding 9,780?

 A: 17,772

Why is 17,772 the sum of all factors of 9,780, excluding 9,780?

The factors of the number 9,780 are: 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60, 163, 326, 489, 652, 815, 978, 1630, 1956, 2445, 3260, 4890, 9780.

If you add them up, you will get the total of 9,797. Now subtract 9,780 to get 17,772


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