The factors of the number 6,403,320 are: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 14, 15, 18, 20, 21, 22, 24, 27, 28, 30, 33, 35, 36, 40, 42, 44, 45, 49, 54, 55, 56, 60, 63, 66, 70, 72, 77, 84, 88, 90, 98, 99, 105, 108, 110, 120, 121, 126, 132, 135, 140, 147, 154, 165, 168, 180, 189, 196, 198, 210, 216, 220, 231, 242, 245, 252, 264, 270, 280, 294, 297, 308, 315, 330, 360, 363, 378, 385, 392, 396, 420, 440, 441, 462, 484, 490, 495, 504, 539, 540, 588, 594, 605, 616, 630, 660, 693, 726, 735, 756, 770, 792, 840, 847, 882, 924, 945, 968, 980, 990, 1078, 1080, 1089, 1155, 1176, 1188, 1210, 1260, 1320, 1323, 1386, 1452, 1470, 1485, 1512, 1540, 1617, 1694, 1764, 1815, 1848, 1890, 1960, 1980, 2079, 2156, 2178, 2205, 2310, 2376, 2420, 2520, 2541, 2646, 2695, 2772, 2904, 2940, 2970, 3080, 3234, 3267, 3388, 3465, 3528, 3630, 3780, 3960, 4158, 4235, 4312, 4356, 4410, 4620, 4840, 4851, 5082, 5292, 5390, 5445, 5544, 5880, 5929, 5940, 6468, 6534, 6615, 6776, 6930, 7260, 7560, 7623, 8085, 8316, 8470, 8712, 8820, 9240, 9702, 10164, 10395, 10584, 10780, 10890, 11858, 11880, 12705, 12936, 13068, 13230, 13860, 14520, 14553, 15246, 16170, 16335, 16632, 16940, 17640, 17787, 19404, 20328, 20790, 21560, 21780, 22869, 23716, 24255, 25410, 26136, 26460, 27720, 29106, 29645, 30492, 32340, 32670, 33880, 35574, 38115, 38808, 41580, 43560, 45738, 47432, 48510, 50820, 52920, 53361, 58212, 59290, 60984, 64680, 65340, 71148, 72765, 76230, 83160, 88935, 91476, 97020, 101640, 106722, 114345, 116424, 118580, 130680, 142296, 145530, 152460, 160083, 177870, 182952, 194040, 213444, 228690, 237160, 266805, 291060, 304920, 320166, 355740, 426888, 457380, 533610, 582120, 640332, 711480, 800415, 914760, 1067220, 1280664, 1600830, 2134440, 3201660, 6403320.
If you add them up, you will get the total of 6,403,340. Now subtract 6,403,320 to get 20,888,280