The factors of the number 4,255,440 are: 1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 14, 15, 16, 17, 20, 21, 24, 28, 30, 34, 35, 40, 42, 48, 51, 56, 60, 68, 70, 80, 84, 85, 102, 105, 112, 119, 120, 136, 140, 149, 168, 170, 204, 210, 238, 240, 255, 272, 280, 298, 336, 340, 357, 408, 420, 447, 476, 510, 560, 595, 596, 680, 714, 745, 816, 840, 894, 952, 1020, 1043, 1190, 1192, 1360, 1428, 1490, 1680, 1785, 1788, 1904, 2040, 2086, 2235, 2380, 2384, 2533, 2856, 2980, 3129, 3570, 3576, 4080, 4172, 4470, 4760, 5066, 5215, 5712, 5960, 6258, 7140, 7152, 7599, 8344, 8940, 9520, 10132, 10430, 11920, 12516, 12665, 14280, 15198, 15645, 16688, 17731, 17880, 20264, 20860, 25032, 25330, 28560, 30396, 31290, 35462, 35760, 37995, 40528, 41720, 50064, 50660, 53193, 60792, 62580, 70924, 75990, 83440, 88655, 101320, 106386, 121584, 125160, 141848, 151980, 177310, 202640, 212772, 250320, 265965, 283696, 303960, 354620, 425544, 531930, 607920, 709240, 851088, 1063860, 1418480, 2127720, 4255440.
If you add them up, you will get the total of 16,070,400.