21087157

素因数分解:

$7^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{43}}^1\times {\mathrm{317}}^1$

素因数の和:397

約数の個数: 32

約数和(自身を含む): 28207872

約数和(自身を除く): 7120715

約数列:

[1, 7, 13, 17, 43, 91, 119, 221, 301, 317, 559, 731, 1547, 2219, 3913, 4121, 5117, 5389, 9503, 13631, 28847, 37723, 66521, 70057, 95417, 177203, 231727, 490399, 1240421, 1622089, 3012451, 21087157]

約数ペア:

[(1, 21087157), (7, 3012451), (13, 1622089), (17, 1240421), (43, 490399), (91, 231727), (119, 177203), (221, 95417), (301, 70057), (317, 66521), (559, 37723), (731, 28847), (1547, 13631), (2219, 9503), (3913, 5389), (4121, 5117)]