21105905

素因数分解:

$5^1\times {\mathrm{43}}^1\times {\mathrm{89}}^1\times {\mathrm{1103}}^1$

素因数の和:1240

約数の個数: 16

約数和(自身を含む): 26231040

約数和(自身を除く): 5125135

約数列:

[1, 5, 43, 89, 215, 445, 1103, 3827, 5515, 19135, 47429, 98167, 237145, 490835, 4221181, 21105905]

約数ペア:

[(1, 21105905), (5, 4221181), (43, 490835), (89, 237145), (215, 98167), (445, 47429), (1103, 19135), (3827, 5515)]