20991657

素因数分解:

$3^1\times {\mathrm{47}}^1\times {\mathrm{53}}^3$

素因数の和:209

約数の個数: 16

約数和(自身を含む): 29134080

約数和(自身を除く): 8142423

約数列:

[1, 3, 47, 53, 141, 159, 2491, 2809, 7473, 8427, 132023, 148877, 396069, 446631, 6997219, 20991657]

約数ペア:

[(1, 20991657), (3, 6997219), (47, 446631), (53, 396069), (141, 148877), (159, 132023), (2491, 8427), (2809, 7473)]