20477780

素因数分解:

$2^2\times 5^1\times {\mathrm{661}}^1\times {\mathrm{1549}}^1$

素因数の和:2219

約数の個数: 24

約数和(自身を含む): 43096200

約数和(自身を除く): 22618420

約数列:

[1, 2, 4, 5, 10, 20, 661, 1322, 1549, 2644, 3098, 3305, 6196, 6610, 7745, 13220, 15490, 30980, 1023889, 2047778, 4095556, 5119445, 10238890, 20477780]

約数ペア:

[(1, 20477780), (2, 10238890), (4, 5119445), (5, 4095556), (10, 2047778), (20, 1023889), (661, 30980), (1322, 15490), (1549, 13220), (2644, 7745), (3098, 6610), (3305, 6196)]