21157972

素因数分解:

$2^2\times {\mathrm{11}}^1\times {\mathrm{61}}^1\times {\mathrm{7883}}^1$

素因数の和:7959

約数の個数: 24

約数和(自身を含む): 41059872

約数和(自身を除く): 19901900

約数列:

[1, 2, 4, 11, 22, 44, 61, 122, 244, 671, 1342, 2684, 7883, 15766, 31532, 86713, 173426, 346852, 480863, 961726, 1923452, 5289493, 10578986, 21157972]

約数ペア:

[(1, 21157972), (2, 10578986), (4, 5289493), (11, 1923452), (22, 961726), (44, 480863), (61, 346852), (122, 173426), (244, 86713), (671, 31532), (1342, 15766), (2684, 7883)]