The factors of the number 6,978,720 are: 1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 14, 15, 16, 20, 21, 24, 28, 30, 31, 32, 35, 40, 42, 48, 56, 60, 62, 67, 70, 80, 84, 93, 96, 105, 112, 120, 124, 134, 140, 155, 160, 168, 186, 201, 210, 217, 224, 240, 248, 268, 280, 310, 335, 336, 372, 402, 420, 434, 465, 469, 480, 496, 536, 560, 620, 651, 670, 672, 744, 804, 840, 868, 930, 938, 992, 1005, 1072, 1085, 1120, 1240, 1302, 1340, 1407, 1488, 1608, 1680, 1736, 1860, 1876, 2010, 2077, 2144, 2170, 2345, 2480, 2604, 2680, 2814, 2976, 3216, 3255, 3360, 3472, 3720, 3752, 4020, 4154, 4340, 4690, 4960, 5208, 5360, 5628, 6231, 6432, 6510, 6944, 7035, 7440, 7504, 8040, 8308, 8680, 9380, 10385, 10416, 10720, 11256, 12462, 13020, 14070, 14539, 14880, 15008, 16080, 16616, 17360, 18760, 20770, 20832, 22512, 24924, 26040, 28140, 29078, 31155, 32160, 33232, 34720, 37520, 41540, 43617, 45024, 49848, 52080, 56280, 58156, 62310, 66464, 72695, 75040, 83080, 87234, 99696, 104160, 112560, 116312, 124620, 145390, 166160, 174468, 199392, 218085, 225120, 232624, 249240, 290780, 332320, 348936, 436170, 465248, 498480, 581560, 697872, 872340, 996960, 1163120, 1395744, 1744680, 2326240, 3489360, 6978720.
If you add them up, you will get the total of 26,320,896.