The factors of the number 100,120,320 are: 1, 2, 3, 4, 5, 6, 8, 9, 10, 12, 15, 16, 18, 20, 24, 27, 30, 32, 36, 40, 45, 48, 54, 60, 64, 72, 80, 90, 96, 108, 120, 128, 135, 144, 160, 180, 192, 216, 240, 256, 270, 288, 320, 360, 384, 432, 480, 540, 576, 640, 720, 768, 864, 960, 1080, 1152, 1280, 1440, 1728, 1920, 2160, 2304, 2880, 2897, 3456, 3840, 4320, 5760, 5794, 6912, 8640, 8691, 11520, 11588, 14485, 17280, 17382, 23176, 26073, 28970, 34560, 34764, 43455, 46352, 52146, 57940, 69528, 78219, 86910, 92704, 104292, 115880, 130365, 139056, 156438, 173820, 185408, 208584, 231760, 260730, 278112, 312876, 347640, 370816, 391095, 417168, 463520, 521460, 556224, 625752, 695280, 741632, 782190, 834336, 927040, 1042920, 1112448, 1251504, 1390560, 1564380, 1668672, 1854080, 2085840, 2224896, 2503008, 2781120, 3128760, 3337344, 3708160, 4171680, 5006016, 5562240, 6257520, 6674688, 8343360, 10012032, 11124480, 12515040, 16686720, 20024064, 25030080, 33373440, 50060160, 100120320.
If you add them up, you will get the total of 355,410,720.