21790100

素因数分解:

$2^2\times 5^2\times {\mathrm{217901}}^1$

素因数の和:217915

約数の個数: 18

約数和(自身を含む): 47284734

約数和(自身を除く): 25494634

約数列:

[1, 2, 4, 5, 10, 20, 25, 50, 100, 217901, 435802, 871604, 1089505, 2179010, 4358020, 5447525, 10895050, 21790100]

約数ペア:

[(1, 21790100), (2, 10895050), (4, 5447525), (5, 4358020), (10, 2179010), (20, 1089505), (25, 871604), (50, 435802), (100, 217901)]