21128723

素因数分解:

$7^1\times {\mathrm{11}}^1\times {\mathrm{331}}^1\times {\mathrm{829}}^1$

素因数の和:1178

約数の個数: 16

約数和(自身を含む): 26453760

約数和(自身を除く): 5325037

約数列:

[1, 7, 11, 77, 331, 829, 2317, 3641, 5803, 9119, 25487, 63833, 274399, 1920793, 3018389, 21128723]

約数ペア:

[(1, 21128723), (7, 3018389), (11, 1920793), (77, 274399), (331, 63833), (829, 25487), (2317, 9119), (3641, 5803)]