The factors of the number 813,120 are: 1, 2, 3, 4, 5, 6, 7, 8, 10, 11, 12, 14, 15, 16, 20, 21, 22, 24, 28, 30, 32, 33, 35, 40, 42, 44, 48, 55, 56, 60, 64, 66, 70, 77, 80, 84, 88, 96, 105, 110, 112, 120, 121, 132, 140, 154, 160, 165, 168, 176, 192, 210, 220, 224, 231, 240, 242, 264, 280, 308, 320, 330, 336, 352, 363, 385, 420, 440, 448, 462, 480, 484, 528, 560, 605, 616, 660, 672, 704, 726, 770, 840, 847, 880, 924, 960, 968, 1056, 1120, 1155, 1210, 1232, 1320, 1344, 1452, 1540, 1680, 1694, 1760, 1815, 1848, 1936, 2112, 2240, 2310, 2420, 2464, 2541, 2640, 2904, 3080, 3360, 3388, 3520, 3630, 3696, 3872, 4235, 4620, 4840, 4928, 5082, 5280, 5808, 6160, 6720, 6776, 7260, 7392, 7744, 8470, 9240, 9680, 10164, 10560, 11616, 12320, 12705, 13552, 14520, 14784, 16940, 18480, 19360, 20328, 23232, 24640, 25410, 27104, 29040, 33880, 36960, 38720, 40656, 50820, 54208, 58080, 67760, 73920, 81312, 101640, 116160, 135520, 162624, 203280, 271040, 406560, 813120.
If you add them up, you will get the total of 3,243,072.