21013951

素因数分解:

$7^1\times {\mathrm{29}}^1\times {\mathrm{61}}^1\times {\mathrm{1697}}^1$

素因数の和:1794

約数の個数: 16

約数和(自身を含む): 25266240

約数和(自身を除く): 4252289

約数列:

[1, 7, 29, 61, 203, 427, 1697, 1769, 11879, 12383, 49213, 103517, 344491, 724619, 3001993, 21013951]

約数ペア:

[(1, 21013951), (7, 3001993), (29, 724619), (61, 344491), (203, 103517), (427, 49213), (1697, 12383), (1769, 11879)]