21395260

素因数分解:

$2^2\times 5^1\times {\mathrm{821}}^1\times {\mathrm{1303}}^1$

素因数の和:2133

約数の個数: 24

約数和(自身を含む): 45019296

約数和(自身を除く): 23624036

約数列:

[1, 2, 4, 5, 10, 20, 821, 1303, 1642, 2606, 3284, 4105, 5212, 6515, 8210, 13030, 16420, 26060, 1069763, 2139526, 4279052, 5348815, 10697630, 21395260]

約数ペア:

[(1, 21395260), (2, 10697630), (4, 5348815), (5, 4279052), (10, 2139526), (20, 1069763), (821, 26060), (1303, 16420), (1642, 13030), (2606, 8210), (3284, 6515), (4105, 5212)]