18996520

素因数分解:

$2^3\times 5^1\times {\mathrm{109}}^1\times {\mathrm{4357}}^1$

素因数の和:4477

約数の個数: 32

約数和(自身を含む): 43144200

約数和(自身を除く): 24147680

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 109, 218, 436, 545, 872, 1090, 2180, 4357, 4360, 8714, 17428, 21785, 34856, 43570, 87140, 174280, 474913, 949826, 1899652, 2374565, 3799304, 4749130, 9498260, 18996520]

約数ペア:

[(1, 18996520), (2, 9498260), (4, 4749130), (5, 3799304), (8, 2374565), (10, 1899652), (20, 949826), (40, 474913), (109, 174280), (218, 87140), (436, 43570), (545, 34856), (872, 21785), (1090, 17428), (2180, 8714), (4357, 4360)]