21457569

素因数分解:

$3^1\times 7^1\times {\mathrm{139}}^1\times {\mathrm{7351}}^1$

素因数の和:7500

約数の個数: 16

約数和(自身を含む): 32936960

約数和(自身を除く): 11479391

約数列:

[1, 3, 7, 21, 139, 417, 973, 2919, 7351, 22053, 51457, 154371, 1021789, 3065367, 7152523, 21457569]

約数ペア:

[(1, 21457569), (3, 7152523), (7, 3065367), (21, 1021789), (139, 154371), (417, 51457), (973, 22053), (2919, 7351)]