21728749

素因数分解:

$7^1\times {\mathrm{61}}^1\times {\mathrm{151}}^1\times {\mathrm{337}}^1$

素因数の和:556

約数の個数: 16

約数和(自身を含む): 25482496

約数和(自身を除く): 3753747

約数列:

[1, 7, 61, 151, 337, 427, 1057, 2359, 9211, 20557, 50887, 64477, 143899, 356209, 3104107, 21728749]

約数ペア:

[(1, 21728749), (7, 3104107), (61, 356209), (151, 143899), (337, 64477), (427, 50887), (1057, 20557), (2359, 9211)]