The factors of the number 5,721,660 are: 1, 2, 3, 4, 5, 6, 7, 9, 10, 12, 14, 15, 18, 19, 20, 21, 28, 30, 35, 36, 38, 42, 45, 57, 60, 63, 70, 76, 84, 90, 95, 105, 114, 126, 133, 140, 171, 180, 190, 210, 228, 239, 252, 266, 285, 315, 342, 380, 399, 420, 478, 532, 570, 630, 665, 684, 717, 798, 855, 956, 1140, 1195, 1197, 1260, 1330, 1434, 1596, 1673, 1710, 1995, 2151, 2390, 2394, 2660, 2868, 3346, 3420, 3585, 3990, 4302, 4541, 4780, 4788, 5019, 5985, 6692, 7170, 7980, 8365, 8604, 9082, 10038, 10755, 11970, 13623, 14340, 15057, 16730, 18164, 20076, 21510, 22705, 23940, 25095, 27246, 30114, 31787, 33460, 40869, 43020, 45410, 50190, 54492, 60228, 63574, 68115, 75285, 81738, 90820, 95361, 100380, 127148, 136230, 150570, 158935, 163476, 190722, 204345, 272460, 286083, 301140, 317870, 381444, 408690, 476805, 572166, 635740, 817380, 953610, 1144332, 1430415, 1907220, 2860830, 5721660.
If you add them up, you will get the total of 20,966,400.