81581320

素因数分解:

$2^3\times 5^1\times {\mathrm{43}}^1\times {\mathrm{47431}}^1$

素因数の和:47485

約数の個数: 32

約数和(自身を含む): 187830720

約数和(自身を除く): 106249400

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 43, 86, 172, 215, 344, 430, 860, 1720, 47431, 94862, 189724, 237155, 379448, 474310, 948620, 1897240, 2039533, 4079066, 8158132, 10197665, 16316264, 20395330, 40790660, 81581320]

約数ペア:

[(1, 81581320), (2, 40790660), (4, 20395330), (5, 16316264), (8, 10197665), (10, 8158132), (20, 4079066), (40, 2039533), (43, 1897240), (86, 948620), (172, 474310), (215, 379448), (344, 237155), (430, 189724), (860, 94862), (1720, 47431)]