The factors of the number 6,620,040 are: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 14, 15, 18, 20, 21, 24, 28, 30, 35, 36, 37, 40, 42, 45, 56, 60, 63, 70, 71, 72, 74, 84, 90, 105, 111, 120, 126, 140, 142, 148, 168, 180, 185, 210, 213, 222, 252, 259, 280, 284, 296, 315, 333, 355, 360, 370, 420, 426, 444, 497, 504, 518, 555, 568, 630, 639, 666, 710, 740, 777, 840, 852, 888, 994, 1036, 1065, 1110, 1260, 1278, 1295, 1332, 1420, 1480, 1491, 1554, 1665, 1704, 1988, 2072, 2130, 2220, 2331, 2485, 2520, 2556, 2590, 2627, 2664, 2840, 2982, 3108, 3195, 3330, 3885, 3976, 4260, 4440, 4473, 4662, 4970, 5112, 5180, 5254, 5964, 6216, 6390, 6660, 7455, 7770, 7881, 8520, 8946, 9324, 9940, 10360, 10508, 11655, 11928, 12780, 13135, 13320, 14910, 15540, 15762, 17892, 18389, 18648, 19880, 21016, 22365, 23310, 23643, 25560, 26270, 29820, 31080, 31524, 35784, 36778, 39405, 44730, 46620, 47286, 52540, 55167, 59640, 63048, 73556, 78810, 89460, 91945, 93240, 94572, 105080, 110334, 118215, 147112, 157620, 165501, 178920, 183890, 189144, 220668, 236430, 275835, 315240, 331002, 367780, 441336, 472860, 551670, 662004, 735560, 827505, 945720, 1103340, 1324008, 1655010, 2206680, 3310020, 6620040.
If you add them up, you will get the total of 25,608,960.