20813860

素因数分解:

$2^2\times 5^1\times {\mathrm{139}}^1\times {\mathrm{7487}}^1$

素因数の和:7635

約数の個数: 24

約数和(自身を含む): 44029440

約数和(自身を除く): 23215580

約数列:

[1, 2, 4, 5, 10, 20, 139, 278, 556, 695, 1390, 2780, 7487, 14974, 29948, 37435, 74870, 149740, 1040693, 2081386, 4162772, 5203465, 10406930, 20813860]

約数ペア:

[(1, 20813860), (2, 10406930), (4, 5203465), (5, 4162772), (10, 2081386), (20, 1040693), (139, 149740), (278, 74870), (556, 37435), (695, 29948), (1390, 14974), (2780, 7487)]