81609820

素因数分解:

$2^2\times 5^1\times {\mathrm{1721}}^1\times {\mathrm{2371}}^1$

素因数の和:4101

約数の個数: 24

約数和(自身を含む): 171552528

約数和(自身を除く): 89942708

約数列:

[1, 2, 4, 5, 10, 20, 1721, 2371, 3442, 4742, 6884, 8605, 9484, 11855, 17210, 23710, 34420, 47420, 4080491, 8160982, 16321964, 20402455, 40804910, 81609820]

約数ペア:

[(1, 81609820), (2, 40804910), (4, 20402455), (5, 16321964), (10, 8160982), (20, 4080491), (1721, 47420), (2371, 34420), (3442, 23710), (4742, 17210), (6884, 11855), (8605, 9484)]