21739781

素因数分解:

$7^2\times {\mathrm{19}}^2\times {\mathrm{1229}}^1$

素因数の和:1281

約数の個数: 18

約数和(自身を含む): 26711910

約数和(自身を除く): 4972129

約数列:

[1, 7, 19, 49, 133, 361, 931, 1229, 2527, 8603, 17689, 23351, 60221, 163457, 443669, 1144199, 3105683, 21739781]

約数ペア:

[(1, 21739781), (7, 3105683), (19, 1144199), (49, 443669), (133, 163457), (361, 60221), (931, 23351), (1229, 17689), (2527, 8603)]