18911991

素因数分解:

$3^1\times 7^3\times {\mathrm{18379}}^1$

素因数の和:18403

約数の個数: 16

約数和(自身を含む): 29408000

約数和(自身を除く): 10496009

約数列:

[1, 3, 7, 21, 49, 147, 343, 1029, 18379, 55137, 128653, 385959, 900571, 2701713, 6303997, 18911991]

約数ペア:

[(1, 18911991), (3, 6303997), (7, 2701713), (21, 900571), (49, 385959), (147, 128653), (343, 55137), (1029, 18379)]