The factors of the number 21,331,520 are: 1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 28, 32, 35, 40, 56, 64, 70, 80, 89, 107, 112, 140, 160, 178, 214, 224, 280, 320, 356, 428, 445, 448, 535, 560, 623, 712, 749, 856, 890, 1070, 1120, 1246, 1424, 1498, 1712, 1780, 2140, 2240, 2492, 2848, 2996, 3115, 3424, 3560, 3745, 4280, 4984, 5696, 5992, 6230, 6848, 7120, 7490, 8560, 9523, 9968, 11984, 12460, 14240, 14980, 17120, 19046, 19936, 23968, 24920, 28480, 29960, 34240, 38092, 39872, 47615, 47936, 49840, 59920, 66661, 76184, 95230, 99680, 119840, 133322, 152368, 190460, 199360, 239680, 266644, 304736, 333305, 380920, 533288, 609472, 666610, 761840, 1066576, 1333220, 1523680, 2133152, 2666440, 3047360, 4266304, 5332880, 10665760, 21331520.
If you add them up, you will get the total of 59,253,120.