16721840

素因数分解:

$2^4\times 5^1\times {\mathrm{43}}^1\times {\mathrm{4861}}^1$

素因数の和:4917

約数の個数: 40

約数和(自身を含む): 39790608

約数和(自身を除く): 23068768

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 43, 80, 86, 172, 215, 344, 430, 688, 860, 1720, 3440, 4861, 9722, 19444, 24305, 38888, 48610, 77776, 97220, 194440, 209023, 388880, 418046, 836092, 1045115, 1672184, 2090230, 3344368, 4180460, 8360920, 16721840]

約数ペア:

[(1, 16721840), (2, 8360920), (4, 4180460), (5, 3344368), (8, 2090230), (10, 1672184), (16, 1045115), (20, 836092), (40, 418046), (43, 388880), (80, 209023), (86, 194440), (172, 97220), (215, 77776), (344, 48610), (430, 38888), (688, 24305), (860, 19444), (1720, 9722), (3440, 4861)]