20691640

素因数分解:

$2^3\times 5^1\times {\mathrm{397}}^1\times {\mathrm{1303}}^1$

素因数の和:1711

約数の個数: 32

約数和(自身を含む): 46709280

約数和(自身を除く): 26017640

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 397, 794, 1303, 1588, 1985, 2606, 3176, 3970, 5212, 6515, 7940, 10424, 13030, 15880, 26060, 52120, 517291, 1034582, 2069164, 2586455, 4138328, 5172910, 10345820, 20691640]

約数ペア:

[(1, 20691640), (2, 10345820), (4, 5172910), (5, 4138328), (8, 2586455), (10, 2069164), (20, 1034582), (40, 517291), (397, 52120), (794, 26060), (1303, 15880), (1588, 13030), (1985, 10424), (2606, 7940), (3176, 6515), (3970, 5212)]