19971640

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{193}}^1\times {\mathrm{199}}^1$

素因数の和:416

約数の個数: 64

約数和(自身を含む): 48888000

約数和(自身を除く): 28916360

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 52, 65, 104, 130, 193, 199, 260, 386, 398, 520, 772, 796, 965, 995, 1544, 1592, 1930, 1990, 2509, 2587, 3860, 3980, 5018, 5174, 7720, 7960, 10036, 10348, 12545, 12935, 20072, 20696, 25090, 25870, 38407, 50180, 51740, 76814, 100360, 103480, 153628, 192035, 307256, 384070, 499291, 768140, 998582, 1536280, 1997164, 2496455, 3994328, 4992910, 9985820, 19971640]

約数ペア:

[(1, 19971640), (2, 9985820), (4, 4992910), (5, 3994328), (8, 2496455), (10, 1997164), (13, 1536280), (20, 998582), (26, 768140), (40, 499291), (52, 384070), (65, 307256), (104, 192035), (130, 153628), (193, 103480), (199, 100360), (260, 76814), (386, 51740), (398, 50180), (520, 38407), (772, 25870), (796, 25090), (965, 20696), (995, 20072), (1544, 12935), (1592, 12545), (1930, 10348), (1990, 10036), (2509, 7960), (2587, 7720), (3860, 5174), (3980, 5018)]