21390100

素因数分解:

$2^2\times 5^2\times {\mathrm{213901}}^1$

素因数の和:213915

約数の個数: 18

約数和(自身を含む): 46416734

約数和(自身を除く): 25026634

約数列:

[1, 2, 4, 5, 10, 20, 25, 50, 100, 213901, 427802, 855604, 1069505, 2139010, 4278020, 5347525, 10695050, 21390100]

約数ペア:

[(1, 21390100), (2, 10695050), (4, 5347525), (5, 4278020), (10, 2139010), (20, 1069505), (25, 855604), (50, 427802), (100, 213901)]