81187640

素因数分解:

$2^3\times 5^1\times {\mathrm{197}}^1\times {\mathrm{10303}}^1$

素因数の和:10511

約数の個数: 32

約数和(自身を含む): 183617280

約数和(自身を除く): 102429640

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 197, 394, 788, 985, 1576, 1970, 3940, 7880, 10303, 20606, 41212, 51515, 82424, 103030, 206060, 412120, 2029691, 4059382, 8118764, 10148455, 16237528, 20296910, 40593820, 81187640]

約数ペア:

[(1, 81187640), (2, 40593820), (4, 20296910), (5, 16237528), (8, 10148455), (10, 8118764), (20, 4059382), (40, 2029691), (197, 412120), (394, 206060), (788, 103030), (985, 82424), (1576, 51515), (1970, 41212), (3940, 20606), (7880, 10303)]