The factors of the number 997,920 are: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 14, 15, 16, 18, 20, 21, 22, 24, 27, 28, 30, 32, 33, 35, 36, 40, 42, 44, 45, 48, 54, 55, 56, 60, 63, 66, 70, 72, 77, 80, 81, 84, 88, 90, 96, 99, 105, 108, 110, 112, 120, 126, 132, 135, 140, 144, 154, 160, 162, 165, 168, 176, 180, 189, 198, 210, 216, 220, 224, 231, 240, 252, 264, 270, 280, 288, 297, 308, 315, 324, 330, 336, 352, 360, 378, 385, 396, 405, 420, 432, 440, 462, 480, 495, 504, 528, 540, 560, 567, 594, 616, 630, 648, 660, 672, 693, 720, 756, 770, 792, 810, 840, 864, 880, 891, 924, 945, 990, 1008, 1056, 1080, 1120, 1134, 1155, 1188, 1232, 1260, 1296, 1320, 1386, 1440, 1485, 1512, 1540, 1584, 1620, 1680, 1760, 1782, 1848, 1890, 1980, 2016, 2079, 2160, 2268, 2310, 2376, 2464, 2520, 2592, 2640, 2772, 2835, 2970, 3024, 3080, 3168, 3240, 3360, 3465, 3564, 3696, 3780, 3960, 4158, 4320, 4455, 4536, 4620, 4752, 5040, 5280, 5544, 5670, 5940, 6048, 6160, 6237, 6480, 6930, 7128, 7392, 7560, 7920, 8316, 8910, 9072, 9240, 9504, 10080, 10395, 11088, 11340, 11880, 12320, 12474, 12960, 13860, 14256, 15120, 15840, 16632, 17820, 18144, 18480, 20790, 22176, 22680, 23760, 24948, 27720, 28512, 30240, 31185, 33264, 35640, 36960, 41580, 45360, 47520, 49896, 55440, 62370, 66528, 71280, 83160, 90720, 99792, 110880, 124740, 142560, 166320, 199584, 249480, 332640, 498960, 997920.
If you add them up, you will get the total of 4,390,848.