Q: What is the sum of all factors of the number 400,404,417 excluding 400,404,417?

A: 263,108,415

Why is 263,108,415 the sum of all factors of 400,404,417, excluding 400,404,417?

The factors of the number 400,404,417 are: 1, 3, 7, 17, 21, 37, 51, 111, 119, 259, 357, 629, 777, 1887, 4403, 13209, 30313, 90939, 212191, 515321, 636573, 1121581, 1545963, 3364743, 3607247, 7851067, 10821741, 19066877, 23553201, 57200631, 133468139, 400404417.

If you add them up, you will get the total of 400,404,680. Now subtract 400,404,417 to get 263,108,415