18407920

素因数分解:

$2^4\times 5^1\times {\mathrm{109}}^1\times {\mathrm{2111}}^1$

素因数の和:2233

約数の個数: 40

約数和(自身を含む): 43211520

約数和(自身を除く): 24803600

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 109, 218, 436, 545, 872, 1090, 1744, 2111, 2180, 4222, 4360, 8444, 8720, 10555, 16888, 21110, 33776, 42220, 84440, 168880, 230099, 460198, 920396, 1150495, 1840792, 2300990, 3681584, 4601980, 9203960, 18407920]

約数ペア:

[(1, 18407920), (2, 9203960), (4, 4601980), (5, 3681584), (8, 2300990), (10, 1840792), (16, 1150495), (20, 920396), (40, 460198), (80, 230099), (109, 168880), (218, 84440), (436, 42220), (545, 33776), (872, 21110), (1090, 16888), (1744, 10555), (2111, 8720), (2180, 8444), (4222, 4360)]