855640

素因数分解:

$2^3\times 5^1\times {\mathrm{21391}}^1$

素因数の和:21402

約数の個数: 16

約数和(自身を含む): 1925280

約数和(自身を除く): 1069640

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 21391, 42782, 85564, 106955, 171128, 213910, 427820, 855640]

約数ペア:

[(1, 855640), (2, 427820), (4, 213910), (5, 171128), (8, 106955), (10, 85564), (20, 42782), (40, 21391)]