19881491

素因数分解:

$7^1\times {\mathrm{71}}^1\times {\mathrm{109}}^1\times {\mathrm{367}}^1$

素因数の和:554

約数の個数: 16

約数和(自身を含む): 23316480

約数和(自身を除く): 3434989

約数列:

[1, 7, 71, 109, 367, 497, 763, 2569, 7739, 26057, 40003, 54173, 182399, 280021, 2840213, 19881491]

約数ペア:

[(1, 19881491), (7, 2840213), (71, 280021), (109, 182399), (367, 54173), (497, 40003), (763, 26057), (2569, 7739)]