21000260020

素因数分解:

$2^2\times 5^1\times {\mathrm{43}}^1\times {\mathrm{167}}^1\times {\mathrm{146221}}^1$

素因数の和:146440

約数の個数: 48

約数和(自身を含む): 45396667008

約数和(自身を除く): 24396406988

約数列:

[1, 2, 4, 5, 10, 20, 43, 86, 167, 172, 215, 334, 430, 668, 835, 860, 1670, 3340, 7181, 14362, 28724, 35905, 71810, 143620, 146221, 292442, 584884, 731105, 1462210, 2924420, 6287503, 12575006, 24418907, 25150012, 31437515, 48837814, 62875030, 97675628, 122094535, 125750060, 244189070, 488378140, 1050013001, 2100026002, 4200052004, 5250065005, 10500130010, 21000260020]

約数ペア:

[(1, 21000260020), (2, 10500130010), (4, 5250065005), (5, 4200052004), (10, 2100026002), (20, 1050013001), (43, 488378140), (86, 244189070), (167, 125750060), (172, 122094535), (215, 97675628), (334, 62875030), (430, 48837814), (668, 31437515), (835, 25150012), (860, 24418907), (1670, 12575006), (3340, 6287503), (7181, 2924420), (14362, 1462210), (28724, 731105), (35905, 584884), (71810, 292442), (143620, 146221)]