21685820

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{83407}}^1$

素因数の和:83429

約数の個数: 24

約数和(自身を含む): 49043904

約数和(自身を除く): 27358084

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 130, 260, 83407, 166814, 333628, 417035, 834070, 1084291, 1668140, 2168582, 4337164, 5421455, 10842910, 21685820]

約数ペア:

[(1, 21685820), (2, 10842910), (4, 5421455), (5, 4337164), (10, 2168582), (13, 1668140), (20, 1084291), (26, 834070), (52, 417035), (65, 333628), (130, 166814), (260, 83407)]