19901564

素因数分解:

$2^2\times {\mathrm{41}}^1\times {\mathrm{121351}}^1$

素因数の和:121396

約数の個数: 12

約数和(自身を含む): 35677488

約数和(自身を除く): 15775924

約数列:

[1, 2, 4, 41, 82, 164, 121351, 242702, 485404, 4975391, 9950782, 19901564]

約数ペア:

[(1, 19901564), (2, 9950782), (4, 4975391), (41, 485404), (82, 242702), (164, 121351)]