663920

素因数分解:

$2^4\times 5^1\times {\mathrm{43}}^1\times {\mathrm{193}}^1$

素因数の和:249

約数の個数: 40

約数和(自身を含む): 1587696

約数和(自身を除く): 923776

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 43, 80, 86, 172, 193, 215, 344, 386, 430, 688, 772, 860, 965, 1544, 1720, 1930, 3088, 3440, 3860, 7720, 8299, 15440, 16598, 33196, 41495, 66392, 82990, 132784, 165980, 331960, 663920]

約数ペア:

[(1, 663920), (2, 331960), (4, 165980), (5, 132784), (8, 82990), (10, 66392), (16, 41495), (20, 33196), (40, 16598), (43, 15440), (80, 8299), (86, 7720), (172, 3860), (193, 3440), (215, 3088), (344, 1930), (386, 1720), (430, 1544), (688, 965), (772, 860)]