18466780

素因数分解:

$2^2\times 5^1\times {\mathrm{43}}^1\times {\mathrm{109}}^1\times {\mathrm{197}}^1$

素因数の和:358

約数の個数: 48

約数和(自身を含む): 40249440

約数和(自身を除く): 21782660

約数列:

[1, 2, 4, 5, 10, 20, 43, 86, 109, 172, 197, 215, 218, 394, 430, 436, 545, 788, 860, 985, 1090, 1970, 2180, 3940, 4687, 8471, 9374, 16942, 18748, 21473, 23435, 33884, 42355, 42946, 46870, 84710, 85892, 93740, 107365, 169420, 214730, 429460, 923339, 1846678, 3693356, 4616695, 9233390, 18466780]

約数ペア:

[(1, 18466780), (2, 9233390), (4, 4616695), (5, 3693356), (10, 1846678), (20, 923339), (43, 429460), (86, 214730), (109, 169420), (172, 107365), (197, 93740), (215, 85892), (218, 84710), (394, 46870), (430, 42946), (436, 42355), (545, 33884), (788, 23435), (860, 21473), (985, 18748), (1090, 16942), (1970, 9374), (2180, 8471), (3940, 4687)]