21211285

素因数分解:

$5^1\times {\mathrm{31}}^1\times {\mathrm{281}}^1\times {\mathrm{487}}^1$

素因数の和:804

約数の個数: 16

約数和(自身を含む): 26422272

約数和(自身を除く): 5210987

約数列:

[1, 5, 31, 155, 281, 487, 1405, 2435, 8711, 15097, 43555, 75485, 136847, 684235, 4242257, 21211285]

約数ペア:

[(1, 21211285), (5, 4242257), (31, 684235), (155, 136847), (281, 75485), (487, 43555), (1405, 15097), (2435, 8711)]