21721868

素因数分解:

$2^2\times 7^1\times {\mathrm{101}}^1\times {\mathrm{7681}}^1$

素因数の和:7793

約数の個数: 24

約数和(自身を含む): 43879584

約数和(自身を除く): 22157716

約数列:

[1, 2, 4, 7, 14, 28, 101, 202, 404, 707, 1414, 2828, 7681, 15362, 30724, 53767, 107534, 215068, 775781, 1551562, 3103124, 5430467, 10860934, 21721868]

約数ペア:

[(1, 21721868), (2, 10860934), (4, 5430467), (7, 3103124), (14, 1551562), (28, 775781), (101, 215068), (202, 107534), (404, 53767), (707, 30724), (1414, 15362), (2828, 7681)]