1388269780

素因数分解:

$2^2\times 5^1\times {\mathrm{109}}^1\times {\mathrm{636821}}^1$

素因数の和:636939

約数の個数: 24

約数和(自身を含む): 2942117640

約数和(自身を除く): 1553847860

約数列:

[1, 2, 4, 5, 10, 20, 109, 218, 436, 545, 1090, 2180, 636821, 1273642, 2547284, 3184105, 6368210, 12736420, 69413489, 138826978, 277653956, 347067445, 694134890, 1388269780]

約数ペア:

[(1, 1388269780), (2, 694134890), (4, 347067445), (5, 277653956), (10, 138826978), (20, 69413489), (109, 12736420), (218, 6368210), (436, 3184105), (545, 2547284), (1090, 1273642), (2180, 636821)]