21000455240

素因数分解:

$2^3\times 5^1\times {\mathrm{31}}^1\times {\mathrm{43}}^1\times {\mathrm{393857}}^1$

素因数の和:393942

約数の個数: 64

約数和(自身を含む): 49909685760

約数和(自身を除く): 28909230520

約数列:

[1, 2, 4, 5, 8, 10, 20, 31, 40, 43, 62, 86, 124, 155, 172, 215, 248, 310, 344, 430, 620, 860, 1240, 1333, 1720, 2666, 5332, 6665, 10664, 13330, 26660, 53320, 393857, 787714, 1575428, 1969285, 3150856, 3938570, 7877140, 12209567, 15754280, 16935851, 24419134, 33871702, 48838268, 61047835, 67743404, 84679255, 97676536, 122095670, 135486808, 169358510, 244191340, 338717020, 488382680, 525011381, 677434040, 1050022762, 2100045524, 2625056905, 4200091048, 5250113810, 10500227620, 21000455240]

約数ペア:

[(1, 21000455240), (2, 10500227620), (4, 5250113810), (5, 4200091048), (8, 2625056905), (10, 2100045524), (20, 1050022762), (31, 677434040), (40, 525011381), (43, 488382680), (62, 338717020), (86, 244191340), (124, 169358510), (155, 135486808), (172, 122095670), (215, 97676536), (248, 84679255), (310, 67743404), (344, 61047835), (430, 48838268), (620, 33871702), (860, 24419134), (1240, 16935851), (1333, 15754280), (1720, 12209567), (2666, 7877140), (5332, 3938570), (6665, 3150856), (10664, 1969285), (13330, 1575428), (26660, 787714), (53320, 393857)]