18942020

素因数分解:

$2^2\times 5^1\times {\mathrm{109}}^1\times {\mathrm{8689}}^1$

素因数の和:8807

約数の個数: 24

約数和(自身を含む): 40147800

約数和(自身を除く): 21205780

約数列:

[1, 2, 4, 5, 10, 20, 109, 218, 436, 545, 1090, 2180, 8689, 17378, 34756, 43445, 86890, 173780, 947101, 1894202, 3788404, 4735505, 9471010, 18942020]

約数ペア:

[(1, 18942020), (2, 9471010), (4, 4735505), (5, 3788404), (10, 1894202), (20, 947101), (109, 173780), (218, 86890), (436, 43445), (545, 34756), (1090, 17378), (2180, 8689)]