20428780

素因数分解:

$2^2\times 5^1\times {\mathrm{109}}^1\times {\mathrm{9371}}^1$

素因数の和:9489

約数の個数: 24

約数和(自身を含む): 43298640

約数和(自身を除く): 22869860

約数列:

[1, 2, 4, 5, 10, 20, 109, 218, 436, 545, 1090, 2180, 9371, 18742, 37484, 46855, 93710, 187420, 1021439, 2042878, 4085756, 5107195, 10214390, 20428780]

約数ペア:

[(1, 20428780), (2, 10214390), (4, 5107195), (5, 4085756), (10, 2042878), (20, 1021439), (109, 187420), (218, 93710), (436, 46855), (545, 37484), (1090, 18742), (2180, 9371)]