81362020

素因数分解:

$2^2\times 5^1\times {\mathrm{43}}^1\times {\mathrm{89}}^1\times {\mathrm{1063}}^1$

素因数の和:1204

約数の個数: 48

約数和(自身を含む): 176964480

約数和(自身を除く): 95602460

約数列:

[1, 2, 4, 5, 10, 20, 43, 86, 89, 172, 178, 215, 356, 430, 445, 860, 890, 1063, 1780, 2126, 3827, 4252, 5315, 7654, 10630, 15308, 19135, 21260, 38270, 45709, 76540, 91418, 94607, 182836, 189214, 228545, 378428, 457090, 473035, 914180, 946070, 1892140, 4068101, 8136202, 16272404, 20340505, 40681010, 81362020]

約数ペア:

[(1, 81362020), (2, 40681010), (4, 20340505), (5, 16272404), (10, 8136202), (20, 4068101), (43, 1892140), (86, 946070), (89, 914180), (172, 473035), (178, 457090), (215, 378428), (356, 228545), (430, 189214), (445, 182836), (860, 94607), (890, 91418), (1063, 76540), (1780, 45709), (2126, 38270), (3827, 21260), (4252, 19135), (5315, 15308), (7654, 10630)]