71325820

素因数分解:

$2^2\times 5^1\times {\mathrm{43}}^1\times {\mathrm{197}}^1\times {\mathrm{421}}^1$

素因数の和:670

約数の個数: 48

約数和(自身を含む): 154411488

約数和(自身を除く): 83085668

約数列:

[1, 2, 4, 5, 10, 20, 43, 86, 172, 197, 215, 394, 421, 430, 788, 842, 860, 985, 1684, 1970, 2105, 3940, 4210, 8420, 8471, 16942, 18103, 33884, 36206, 42355, 72412, 82937, 84710, 90515, 165874, 169420, 181030, 331748, 362060, 414685, 829370, 1658740, 3566291, 7132582, 14265164, 17831455, 35662910, 71325820]

約数ペア:

[(1, 71325820), (2, 35662910), (4, 17831455), (5, 14265164), (10, 7132582), (20, 3566291), (43, 1658740), (86, 829370), (172, 414685), (197, 362060), (215, 331748), (394, 181030), (421, 169420), (430, 165874), (788, 90515), (842, 84710), (860, 82937), (985, 72412), (1684, 42355), (1970, 36206), (2105, 33884), (3940, 18103), (4210, 16942), (8420, 8471)]