205540

素因数分解:

$2^2\times 5^1\times {\mathrm{43}}^1\times {\mathrm{239}}^1$

素因数の和:291

約数の個数: 24

約数和(自身を含む): 443520

約数和(自身を除く): 237980

約数列:

[1, 2, 4, 5, 10, 20, 43, 86, 172, 215, 239, 430, 478, 860, 956, 1195, 2390, 4780, 10277, 20554, 41108, 51385, 102770, 205540]

約数ペア:

[(1, 205540), (2, 102770), (4, 51385), (5, 41108), (10, 20554), (20, 10277), (43, 4780), (86, 2390), (172, 1195), (215, 956), (239, 860), (430, 478)]