21290647

素因数分解:

$7^2\times {\mathrm{17}}^1\times {\mathrm{61}}^1\times {\mathrm{419}}^1$

素因数の和:511

約数の個数: 24

約数和(自身を含む): 26717040

約数和(自身を除く): 5426393

約数列:

[1, 7, 17, 49, 61, 119, 419, 427, 833, 1037, 2933, 2989, 7123, 7259, 20531, 25559, 49861, 50813, 178913, 349027, 434503, 1252391, 3041521, 21290647]

約数ペア:

[(1, 21290647), (7, 3041521), (17, 1252391), (49, 434503), (61, 349027), (119, 178913), (419, 50813), (427, 49861), (833, 25559), (1037, 20531), (2933, 7259), (2989, 7123)]