The factors of the number 20,559,840 are: 1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 14, 15, 16, 20, 21, 24, 28, 29, 30, 32, 35, 40, 42, 48, 56, 58, 60, 70, 80, 84, 87, 96, 105, 112, 116, 120, 140, 145, 160, 168, 174, 203, 210, 211, 224, 232, 240, 280, 290, 336, 348, 406, 420, 422, 435, 464, 480, 560, 580, 609, 633, 672, 696, 812, 840, 844, 870, 928, 1015, 1055, 1120, 1160, 1218, 1266, 1392, 1477, 1624, 1680, 1688, 1740, 2030, 2110, 2320, 2436, 2532, 2784, 2954, 3045, 3165, 3248, 3360, 3376, 3480, 4060, 4220, 4431, 4640, 4872, 5064, 5908, 6090, 6119, 6330, 6496, 6752, 6960, 7385, 8120, 8440, 8862, 9744, 10128, 11816, 12180, 12238, 12660, 13920, 14770, 16240, 16880, 17724, 18357, 19488, 20256, 22155, 23632, 24360, 24476, 25320, 29540, 30595, 32480, 33760, 35448, 36714, 42833, 44310, 47264, 48720, 48952, 50640, 59080, 61190, 70896, 73428, 85666, 88620, 91785, 97440, 97904, 101280, 118160, 122380, 128499, 141792, 146856, 171332, 177240, 183570, 195808, 214165, 236320, 244760, 256998, 293712, 342664, 354480, 367140, 428330, 489520, 513996, 587424, 642495, 685328, 708960, 734280, 856660, 979040, 1027992, 1284990, 1370656, 1468560, 1713320, 2055984, 2569980, 2937120, 3426640, 4111968, 5139960, 6853280, 10279920, 20559840.
If you add them up, you will get the total of 76,930,560.