21128500

素因数分解:

$2^2\times 5^3\times {\mathrm{42257}}^1$

素因数の和:42276

約数の個数: 24

約数和(自身を含む): 46145736

約数和(自身を除く): 25017236

約数列:

[1, 2, 4, 5, 10, 20, 25, 50, 100, 125, 250, 500, 42257, 84514, 169028, 211285, 422570, 845140, 1056425, 2112850, 4225700, 5282125, 10564250, 21128500]

約数ペア:

[(1, 21128500), (2, 10564250), (4, 5282125), (5, 4225700), (10, 2112850), (20, 1056425), (25, 845140), (50, 422570), (100, 211285), (125, 169028), (250, 84514), (500, 42257)]