18140840

素因数分解:

$2^3\times 5^1\times {\mathrm{43}}^1\times {\mathrm{53}}^1\times {\mathrm{199}}^1$

素因数の和:306

約数の個数: 64

約数和(自身を含む): 42768000

約数和(自身を除く): 24627160

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 43, 53, 86, 106, 172, 199, 212, 215, 265, 344, 398, 424, 430, 530, 796, 860, 995, 1060, 1592, 1720, 1990, 2120, 2279, 3980, 4558, 7960, 8557, 9116, 10547, 11395, 17114, 18232, 21094, 22790, 34228, 42188, 42785, 45580, 52735, 68456, 84376, 85570, 91160, 105470, 171140, 210940, 342280, 421880, 453521, 907042, 1814084, 2267605, 3628168, 4535210, 9070420, 18140840]

約数ペア:

[(1, 18140840), (2, 9070420), (4, 4535210), (5, 3628168), (8, 2267605), (10, 1814084), (20, 907042), (40, 453521), (43, 421880), (53, 342280), (86, 210940), (106, 171140), (172, 105470), (199, 91160), (212, 85570), (215, 84376), (265, 68456), (344, 52735), (398, 45580), (424, 42785), (430, 42188), (530, 34228), (796, 22790), (860, 21094), (995, 18232), (1060, 17114), (1592, 11395), (1720, 10547), (1990, 9116), (2120, 8557), (2279, 7960), (3980, 4558)]