21045125

素因数分解:

$5^3\times {\mathrm{31}}^1\times {\mathrm{5431}}^1$

素因数の和:5477

約数の個数: 16

約数和(自身を含む): 27116544

約数和(自身を除く): 6071419

約数列:

[1, 5, 25, 31, 125, 155, 775, 3875, 5431, 27155, 135775, 168361, 678875, 841805, 4209025, 21045125]

約数ペア:

[(1, 21045125), (5, 4209025), (25, 841805), (31, 678875), (125, 168361), (155, 135775), (775, 27155), (3875, 5431)]