21390700

素因数分解:

$2^2\times 5^2\times {\mathrm{409}}^1\times {\mathrm{523}}^1$

素因数の和:946

約数の個数: 36

約数和(自身を含む): 46620280

約数和(自身を除く): 25229580

約数列:

[1, 2, 4, 5, 10, 20, 25, 50, 100, 409, 523, 818, 1046, 1636, 2045, 2092, 2615, 4090, 5230, 8180, 10225, 10460, 13075, 20450, 26150, 40900, 52300, 213907, 427814, 855628, 1069535, 2139070, 4278140, 5347675, 10695350, 21390700]

約数ペア:

[(1, 21390700), (2, 10695350), (4, 5347675), (5, 4278140), (10, 2139070), (20, 1069535), (25, 855628), (50, 427814), (100, 213907), (409, 52300), (523, 40900), (818, 26150), (1046, 20450), (1636, 13075), (2045, 10460), (2092, 10225), (2615, 8180), (4090, 5230)]