21378371

素因数分解:

$7^1\times {\mathrm{103}}^1\times {\mathrm{149}}^1\times {\mathrm{199}}^1$

素因数の和:458

約数の個数: 16

約数和(自身を含む): 24960000

約数和(自身を除く): 3581629

約数列:

[1, 7, 103, 149, 199, 721, 1043, 1393, 15347, 20497, 29651, 107429, 143479, 207557, 3054053, 21378371]

約数ペア:

[(1, 21378371), (7, 3054053), (103, 207557), (149, 143479), (199, 107429), (721, 29651), (1043, 20497), (1393, 15347)]