The factors of the number 1,228,920 are: 1, 2, 3, 4, 5, 6, 7, 8, 10, 11, 12, 14, 15, 19, 20, 21, 22, 24, 28, 30, 33, 35, 38, 40, 42, 44, 49, 55, 56, 57, 60, 66, 70, 76, 77, 84, 88, 95, 98, 105, 110, 114, 120, 132, 133, 140, 147, 152, 154, 165, 168, 190, 196, 209, 210, 220, 228, 231, 245, 264, 266, 280, 285, 294, 308, 330, 380, 385, 392, 399, 418, 420, 440, 456, 462, 490, 532, 539, 570, 588, 616, 627, 660, 665, 735, 760, 770, 798, 836, 840, 924, 931, 980, 1045, 1064, 1078, 1140, 1155, 1176, 1254, 1320, 1330, 1463, 1470, 1540, 1596, 1617, 1672, 1848, 1862, 1960, 1995, 2090, 2156, 2280, 2310, 2508, 2660, 2695, 2793, 2926, 2940, 3080, 3135, 3192, 3234, 3724, 3990, 4180, 4312, 4389, 4620, 4655, 5016, 5320, 5390, 5586, 5852, 5880, 6270, 6468, 7315, 7448, 7980, 8085, 8360, 8778, 9240, 9310, 10241, 10780, 11172, 11704, 12540, 12936, 13965, 14630, 15960, 16170, 17556, 18620, 20482, 21560, 21945, 22344, 25080, 27930, 29260, 30723, 32340, 35112, 37240, 40964, 43890, 51205, 55860, 58520, 61446, 64680, 81928, 87780, 102410, 111720, 122892, 153615, 175560, 204820, 245784, 307230, 409640, 614460, 1228920.
If you add them up, you will get the total of 4,924,800.