20707640

素因数分解:

$2^3\times 5^1\times {\mathrm{401}}^1\times {\mathrm{1291}}^1$

素因数の和:1703

約数の個数: 32

約数和(自身を含む): 46744560

約数和(自身を除く): 26036920

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 401, 802, 1291, 1604, 2005, 2582, 3208, 4010, 5164, 6455, 8020, 10328, 12910, 16040, 25820, 51640, 517691, 1035382, 2070764, 2588455, 4141528, 5176910, 10353820, 20707640]

約数ペア:

[(1, 20707640), (2, 10353820), (4, 5176910), (5, 4141528), (8, 2588455), (10, 2070764), (20, 1035382), (40, 517691), (401, 51640), (802, 25820), (1291, 16040), (1604, 12910), (2005, 10328), (2582, 8020), (3208, 6455), (4010, 5164)]