Why is 3,780 the sum of all factors of 1,640, including 1,640?
The factors of the number 1,640 are: 1, 2, 4, 5, 8, 10, 20, 40, 41, 82, 164, 205, 328, 410, 820, 1640.
If you add them up, you will get the total of 3,780.
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