21198220

素因数分解:

$2^2\times 5^1\times {\mathrm{821}}^1\times {\mathrm{1291}}^1$

素因数の和:2121

約数の個数: 24

約数和(自身を含む): 44605008

約数和(自身を除く): 23406788

約数列:

[1, 2, 4, 5, 10, 20, 821, 1291, 1642, 2582, 3284, 4105, 5164, 6455, 8210, 12910, 16420, 25820, 1059911, 2119822, 4239644, 5299555, 10599110, 21198220]

約数ペア:

[(1, 21198220), (2, 10599110), (4, 5299555), (5, 4239644), (10, 2119822), (20, 1059911), (821, 25820), (1291, 16420), (1642, 12910), (2582, 8210), (3284, 6455), (4105, 5164)]