18686960

素因数分解:

$2^4\times 5^1\times {\mathrm{109}}^1\times {\mathrm{2143}}^1$

素因数の和:2265

約数の個数: 40

約数和(自身を含む): 43866240

約数和(自身を除く): 25179280

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 109, 218, 436, 545, 872, 1090, 1744, 2143, 2180, 4286, 4360, 8572, 8720, 10715, 17144, 21430, 34288, 42860, 85720, 171440, 233587, 467174, 934348, 1167935, 1868696, 2335870, 3737392, 4671740, 9343480, 18686960]

約数ペア:

[(1, 18686960), (2, 9343480), (4, 4671740), (5, 3737392), (8, 2335870), (10, 1868696), (16, 1167935), (20, 934348), (40, 467174), (80, 233587), (109, 171440), (218, 85720), (436, 42860), (545, 34288), (872, 21430), (1090, 17144), (1744, 10715), (2143, 8720), (2180, 8572), (4286, 4360)]