20428880

素因数分解:

$2^4\times 5^1\times {\mathrm{255361}}^1$

素因数の和:255374

約数の個数: 20

約数和(自身を含む): 47497332

約数和(自身を除く): 27068452

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 255361, 510722, 1021444, 1276805, 2042888, 2553610, 4085776, 5107220, 10214440, 20428880]

約数ペア:

[(1, 20428880), (2, 10214440), (4, 5107220), (5, 4085776), (8, 2553610), (10, 2042888), (16, 1276805), (20, 1021444), (40, 510722), (80, 255361)]