21999820

素因数分解:

$2^2\times 5^1\times {\mathrm{101}}^1\times {\mathrm{10891}}^1$

素因数の和:11001

約数の個数: 24

約数和(自身を含む): 46661328

約数和(自身を除く): 24661508

約数列:

[1, 2, 4, 5, 10, 20, 101, 202, 404, 505, 1010, 2020, 10891, 21782, 43564, 54455, 108910, 217820, 1099991, 2199982, 4399964, 5499955, 10999910, 21999820]

約数ペア:

[(1, 21999820), (2, 10999910), (4, 5499955), (5, 4399964), (10, 2199982), (20, 1099991), (101, 217820), (202, 108910), (404, 54455), (505, 43564), (1010, 21782), (2020, 10891)]