21165391

素因数分解:

${\mathrm{13}}^2\times {\mathrm{17}}^1\times {\mathrm{53}}^1\times {\mathrm{139}}^1$

素因数の和:235

約数の個数: 24

約数和(自身を含む): 24902640

約数和(自身を除く): 3737249

約数列:

[1, 13, 17, 53, 139, 169, 221, 689, 901, 1807, 2363, 2873, 7367, 8957, 11713, 23491, 30719, 95771, 125239, 152269, 399347, 1245023, 1628107, 21165391]

約数ペア:

[(1, 21165391), (13, 1628107), (17, 1245023), (53, 399347), (139, 152269), (169, 125239), (221, 95771), (689, 30719), (901, 23491), (1807, 11713), (2363, 8957), (2873, 7367)]