Q: What is the sum of all factors of the number 639,972 including 639,972?

Why is 1,676,220 the sum of all factors of 639,972, including 639,972?

The factors of the number 639,972 are: 1, 2, 3, 4, 6, 9, 12, 18, 29, 36, 58, 87, 116, 174, 261, 348, 522, 613, 1044, 1226, 1839, 2452, 3678, 5517, 7356, 11034, 17777, 22068, 35554, 53331, 71108, 106662, 159993, 213324, 319986, 639972.

If you add them up, you will get the total of 1,676,220.

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