21260920

素因数分解:

$2^3\times 5^1\times {\mathrm{43}}^1\times {\mathrm{47}}^1\times {\mathrm{263}}^1$

素因数の和:364

約数の個数: 64

約数和(自身を含む): 50181120

約数和(自身を除く): 28920200

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 43, 47, 86, 94, 172, 188, 215, 235, 263, 344, 376, 430, 470, 526, 860, 940, 1052, 1315, 1720, 1880, 2021, 2104, 2630, 4042, 5260, 8084, 10105, 10520, 11309, 12361, 16168, 20210, 22618, 24722, 40420, 45236, 49444, 56545, 61805, 80840, 90472, 98888, 113090, 123610, 226180, 247220, 452360, 494440, 531523, 1063046, 2126092, 2657615, 4252184, 5315230, 10630460, 21260920]

約数ペア:

[(1, 21260920), (2, 10630460), (4, 5315230), (5, 4252184), (8, 2657615), (10, 2126092), (20, 1063046), (40, 531523), (43, 494440), (47, 452360), (86, 247220), (94, 226180), (172, 123610), (188, 113090), (215, 98888), (235, 90472), (263, 80840), (344, 61805), (376, 56545), (430, 49444), (470, 45236), (526, 40420), (860, 24722), (940, 22618), (1052, 20210), (1315, 16168), (1720, 12361), (1880, 11309), (2021, 10520), (2104, 10105), (2630, 8084), (4042, 5260)]