20909439

素因数分解:

$3^2\times {\mathrm{17}}^2\times {\mathrm{8039}}^1$

素因数の和:8079

約数の個数: 18

約数和(自身を含む): 32087640

約数和(自身を除く): 11178201

約数列:

[1, 3, 9, 17, 51, 153, 289, 867, 2601, 8039, 24117, 72351, 136663, 409989, 1229967, 2323271, 6969813, 20909439]

約数ペア:

[(1, 20909439), (3, 6969813), (9, 2323271), (17, 1229967), (51, 409989), (153, 136663), (289, 72351), (867, 24117), (2601, 8039)]