The factors of the number 515,426,520 are: 1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 14, 15, 20, 21, 24, 28, 30, 35, 40, 42, 56, 60, 70, 84, 105, 120, 140, 168, 210, 280, 311, 420, 622, 840, 933, 1244, 1555, 1866, 1973, 2177, 2488, 3110, 3732, 3946, 4354, 4665, 5919, 6220, 6531, 7464, 7892, 8708, 9330, 9865, 10885, 11838, 12440, 13062, 13811, 15784, 17416, 18660, 19730, 21770, 23676, 26124, 27622, 29595, 32655, 37320, 39460, 41433, 43540, 47352, 52248, 55244, 59190, 65310, 69055, 78920, 82866, 87080, 110488, 118380, 130620, 138110, 165732, 207165, 236760, 261240, 276220, 331464, 414330, 552440, 613603, 828660, 1227206, 1657320, 1840809, 2454412, 3068015, 3681618, 4295221, 4908824, 6136030, 7363236, 8590442, 9204045, 12272060, 12885663, 14726472, 17180884, 18408090, 21476105, 24544120, 25771326, 34361768, 36816180, 42952210, 51542652, 64428315, 73632360, 85904420, 103085304, 128856630, 171808840, 257713260, 515426520.
If you add them up, you will get the total of 1,773,757,440.