81680440

素因数分解:

$2^3\times 5^1\times {\mathrm{223}}^1\times {\mathrm{9157}}^1$

素因数の和:9391

約数の個数: 32

約数和(自身を含む): 184625280

約数和(自身を除く): 102944840

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 223, 446, 892, 1115, 1784, 2230, 4460, 8920, 9157, 18314, 36628, 45785, 73256, 91570, 183140, 366280, 2042011, 4084022, 8168044, 10210055, 16336088, 20420110, 40840220, 81680440]

約数ペア:

[(1, 81680440), (2, 40840220), (4, 20420110), (5, 16336088), (8, 10210055), (10, 8168044), (20, 4084022), (40, 2042011), (223, 366280), (446, 183140), (892, 91570), (1115, 73256), (1784, 45785), (2230, 36628), (4460, 18314), (8920, 9157)]