21920540

素因数分解:

$2^2\times 5^1\times {\mathrm{43}}^1\times {\mathrm{71}}^1\times {\mathrm{359}}^1$

素因数の和:482

約数の個数: 48

約数和(自身を含む): 47900160

約数和(自身を除く): 25979620

約数列:

[1, 2, 4, 5, 10, 20, 43, 71, 86, 142, 172, 215, 284, 355, 359, 430, 710, 718, 860, 1420, 1436, 1795, 3053, 3590, 6106, 7180, 12212, 15265, 15437, 25489, 30530, 30874, 50978, 61060, 61748, 77185, 101956, 127445, 154370, 254890, 308740, 509780, 1096027, 2192054, 4384108, 5480135, 10960270, 21920540]

約数ペア:

[(1, 21920540), (2, 10960270), (4, 5480135), (5, 4384108), (10, 2192054), (20, 1096027), (43, 509780), (71, 308740), (86, 254890), (142, 154370), (172, 127445), (215, 101956), (284, 77185), (355, 61748), (359, 61060), (430, 50978), (710, 30874), (718, 30530), (860, 25489), (1420, 15437), (1436, 15265), (1795, 12212), (3053, 7180), (3590, 6106)]