21809081

素因数分解:

$7^1\times {\mathrm{47}}^1\times {\mathrm{151}}^1\times {\mathrm{439}}^1$

素因数の和:644

約数の個数: 16

約数和(自身を含む): 25681920

約数和(自身を除く): 3872839

約数列:

[1, 7, 47, 151, 329, 439, 1057, 3073, 7097, 20633, 49679, 66289, 144431, 464023, 3115583, 21809081]

約数ペア:

[(1, 21809081), (7, 3115583), (47, 464023), (151, 144431), (329, 66289), (439, 49679), (1057, 20633), (3073, 7097)]