20117980

素因数分解:

$2^2\times 5^1\times {\mathrm{43}}^1\times {\mathrm{149}}^1\times {\mathrm{157}}^1$

素因数の和:358

約数の個数: 48

約数和(自身を含む): 43797600

約数和(自身を除く): 23679620

約数列:

[1, 2, 4, 5, 10, 20, 43, 86, 149, 157, 172, 215, 298, 314, 430, 596, 628, 745, 785, 860, 1490, 1570, 2980, 3140, 6407, 6751, 12814, 13502, 23393, 25628, 27004, 32035, 33755, 46786, 64070, 67510, 93572, 116965, 128140, 135020, 233930, 467860, 1005899, 2011798, 4023596, 5029495, 10058990, 20117980]

約数ペア:

[(1, 20117980), (2, 10058990), (4, 5029495), (5, 4023596), (10, 2011798), (20, 1005899), (43, 467860), (86, 233930), (149, 135020), (157, 128140), (172, 116965), (215, 93572), (298, 67510), (314, 64070), (430, 46786), (596, 33755), (628, 32035), (745, 27004), (785, 25628), (860, 23393), (1490, 13502), (1570, 12814), (2980, 6751), (3140, 6407)]