Q: What is the sum of all factors of the number 1,780 excluding 1,780?

 A: 2,000

Why is 2,000 the sum of all factors of 1,780, excluding 1,780?

The factors of the number 1,780 are: 1, 2, 4, 5, 10, 20, 89, 178, 356, 445, 890, 1780.

If you add them up, you will get the total of 1,782. Now subtract 1,780 to get 2,000


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