The factors of the number 836,410,640 are: 1, 2, 4, 5, 8, 10, 13, 16, 20, 23, 26, 40, 46, 52, 65, 73, 80, 92, 104, 115, 130, 146, 184, 208, 230, 260, 292, 299, 365, 368, 460, 479, 520, 584, 598, 730, 920, 949, 958, 1040, 1168, 1196, 1460, 1495, 1679, 1840, 1898, 1916, 2392, 2395, 2920, 2990, 3358, 3796, 3832, 4745, 4784, 4790, 5840, 5980, 6227, 6716, 7592, 7664, 8395, 9490, 9580, 11017, 11960, 12454, 13432, 15184, 16790, 18980, 19160, 21827, 22034, 23920, 24908, 26864, 31135, 33580, 34967, 37960, 38320, 43654, 44068, 49816, 55085, 62270, 67160, 69934, 75920, 87308, 88136, 99632, 109135, 110170, 124540, 134320, 139868, 143221, 174616, 174835, 176272, 218270, 220340, 249080, 279736, 286442, 349232, 349670, 436540, 440680, 454571, 498160, 559472, 572884, 699340, 716105, 804241, 873080, 881360, 909142, 1145768, 1398680, 1432210, 1608482, 1746160, 1818284, 2272855, 2291536, 2797360, 2864420, 3216964, 3636568, 4021205, 4545710, 5728840, 6433928, 7273136, 8042410, 9091420, 10455133, 11457680, 12867856, 16084820, 18182840, 20910266, 32169640, 36365680, 41820532, 52275665, 64339280, 83641064, 104551330, 167282128, 209102660, 418205320, 836410640.
If you add them up, you will get the total of 2,219,857,920.