28145980

素因数分解:

$2^2\times 5^1\times {\mathrm{109}}^1\times {\mathrm{12911}}^1$

素因数の和:13029

約数の個数: 24

約数和(自身を含む): 59653440

約数和(自身を除く): 31507460

約数列:

[1, 2, 4, 5, 10, 20, 109, 218, 436, 545, 1090, 2180, 12911, 25822, 51644, 64555, 129110, 258220, 1407299, 2814598, 5629196, 7036495, 14072990, 28145980]

約数ペア:

[(1, 28145980), (2, 14072990), (4, 7036495), (5, 5629196), (10, 2814598), (20, 1407299), (109, 258220), (218, 129110), (436, 64555), (545, 51644), (1090, 25822), (2180, 12911)]