The factors of the number 15,668,856 are: 1, 2, 3, 4, 6, 7, 8, 9, 12, 14, 18, 21, 24, 27, 28, 36, 42, 43, 54, 56, 63, 72, 84, 86, 108, 126, 129, 168, 172, 189, 216, 241, 252, 258, 301, 344, 378, 387, 482, 504, 516, 602, 723, 756, 774, 903, 964, 1032, 1161, 1204, 1446, 1512, 1548, 1687, 1806, 1928, 2169, 2322, 2408, 2709, 2892, 3096, 3374, 3612, 4338, 4644, 5061, 5418, 5784, 6507, 6748, 7224, 8127, 8676, 9288, 10122, 10363, 10836, 13014, 13496, 15183, 16254, 17352, 20244, 20726, 21672, 26028, 30366, 31089, 32508, 40488, 41452, 45549, 52056, 60732, 62178, 65016, 72541, 82904, 91098, 93267, 121464, 124356, 145082, 182196, 186534, 217623, 248712, 279801, 290164, 364392, 373068, 435246, 559602, 580328, 652869, 746136, 870492, 1119204, 1305738, 1740984, 1958607, 2238408, 2611476, 3917214, 5222952, 7834428, 15668856.
If you add them up, you will get the total of 51,110,400.