21257965

素因数分解:

$5^1\times {\mathrm{73}}^1\times {\mathrm{139}}^1\times {\mathrm{419}}^1$

素因数の和:636

約数の個数: 16

約数和(自身を含む): 26107200

約数和(自身を除く): 4849235

約数列:

[1, 5, 73, 139, 365, 419, 695, 2095, 10147, 30587, 50735, 58241, 152935, 291205, 4251593, 21257965]

約数ペア:

[(1, 21257965), (5, 4251593), (73, 291205), (139, 152935), (365, 58241), (419, 50735), (695, 30587), (2095, 10147)]