18843920

素因数分解:

$2^4\times 5^1\times {\mathrm{109}}^1\times {\mathrm{2161}}^1$

素因数の和:2283

約数の個数: 40

約数和(自身を含む): 44234520

約数和(自身を除く): 25390600

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 109, 218, 436, 545, 872, 1090, 1744, 2161, 2180, 4322, 4360, 8644, 8720, 10805, 17288, 21610, 34576, 43220, 86440, 172880, 235549, 471098, 942196, 1177745, 1884392, 2355490, 3768784, 4710980, 9421960, 18843920]

約数ペア:

[(1, 18843920), (2, 9421960), (4, 4710980), (5, 3768784), (8, 2355490), (10, 1884392), (16, 1177745), (20, 942196), (40, 471098), (80, 235549), (109, 172880), (218, 86440), (436, 43220), (545, 34576), (872, 21610), (1090, 17288), (1744, 10805), (2161, 8720), (2180, 8644), (4322, 4360)]