81645820

素因数分解:

$2^2\times 5^1\times {\mathrm{43}}^1\times {\mathrm{139}}^1\times {\mathrm{683}}^1$

素因数の和:874

約数の個数: 48

約数和(自身を含む): 176964480

約数和(自身を除く): 95318660

約数列:

[1, 2, 4, 5, 10, 20, 43, 86, 139, 172, 215, 278, 430, 556, 683, 695, 860, 1366, 1390, 2732, 2780, 3415, 5977, 6830, 11954, 13660, 23908, 29369, 29885, 58738, 59770, 94937, 117476, 119540, 146845, 189874, 293690, 379748, 474685, 587380, 949370, 1898740, 4082291, 8164582, 16329164, 20411455, 40822910, 81645820]

約数ペア:

[(1, 81645820), (2, 40822910), (4, 20411455), (5, 16329164), (10, 8164582), (20, 4082291), (43, 1898740), (86, 949370), (139, 587380), (172, 474685), (215, 379748), (278, 293690), (430, 189874), (556, 146845), (683, 119540), (695, 117476), (860, 94937), (1366, 59770), (1390, 58738), (2732, 29885), (2780, 29369), (3415, 23908), (5977, 13660), (6830, 11954)]