21170620

素因数分解:

$2^2\times 5^1\times {\mathrm{43}}^1\times {\mathrm{103}}^1\times {\mathrm{239}}^1$

素因数の和:394

約数の個数: 48

約数和(自身を含む): 46126080

約数和(自身を除く): 24955460

約数列:

[1, 2, 4, 5, 10, 20, 43, 86, 103, 172, 206, 215, 239, 412, 430, 478, 515, 860, 956, 1030, 1195, 2060, 2390, 4429, 4780, 8858, 10277, 17716, 20554, 22145, 24617, 41108, 44290, 49234, 51385, 88580, 98468, 102770, 123085, 205540, 246170, 492340, 1058531, 2117062, 4234124, 5292655, 10585310, 21170620]

約数ペア:

[(1, 21170620), (2, 10585310), (4, 5292655), (5, 4234124), (10, 2117062), (20, 1058531), (43, 492340), (86, 246170), (103, 205540), (172, 123085), (206, 102770), (215, 98468), (239, 88580), (412, 51385), (430, 49234), (478, 44290), (515, 41108), (860, 24617), (956, 22145), (1030, 20554), (1195, 17716), (2060, 10277), (2390, 8858), (4429, 4780)]