81418640

素因数分解:

$2^4\times 5^1\times {\mathrm{109}}^1\times {\mathrm{9337}}^1$

素因数の和:9459

約数の個数: 40

約数和(自身を含む): 191055480

約数和(自身を除く): 109636840

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 109, 218, 436, 545, 872, 1090, 1744, 2180, 4360, 8720, 9337, 18674, 37348, 46685, 74696, 93370, 149392, 186740, 373480, 746960, 1017733, 2035466, 4070932, 5088665, 8141864, 10177330, 16283728, 20354660, 40709320, 81418640]

約数ペア:

[(1, 81418640), (2, 40709320), (4, 20354660), (5, 16283728), (8, 10177330), (10, 8141864), (16, 5088665), (20, 4070932), (40, 2035466), (80, 1017733), (109, 746960), (218, 373480), (436, 186740), (545, 149392), (872, 93370), (1090, 74696), (1744, 46685), (2180, 37348), (4360, 18674), (8720, 9337)]