Q: What is the sum of all factors of the number 399,420 including 399,420?
A: 1,389,024
The factors of the number 399,420 are: 1, 2, 3, 4, 5, 6, 7, 9, 10, 12, 14, 15, 18, 20, 21, 28, 30, 35, 36, 42, 45, 60, 63, 70, 84, 90, 105, 126, 140, 180, 210, 252, 315, 317, 420, 630, 634, 951, 1260, 1268, 1585, 1902, 2219, 2853, 3170, 3804, 4438, 4755, 5706, 6340, 6657, 8876, 9510, 11095, 11412, 13314, 14265, 19020, 19971, 22190, 26628, 28530, 33285, 39942, 44380, 57060, 66570, 79884, 99855, 133140, 199710, 399420.
If you add them up, you will get the total of 1,389,024.