21069181

素因数分解:

$7^1\times {\mathrm{31}}^1\times {\mathrm{151}}^1\times {\mathrm{643}}^1$

素因数の和:832

約数の個数: 16

約数和(自身を含む): 25059328

約数和(自身を除く): 3990147

約数列:

[1, 7, 31, 151, 217, 643, 1057, 4501, 4681, 19933, 32767, 97093, 139531, 679651, 3009883, 21069181]

約数ペア:

[(1, 21069181), (7, 3009883), (31, 679651), (151, 139531), (217, 97093), (643, 32767), (1057, 19933), (4501, 4681)]