12781640

素因数分解:

$2^3\times 5^1\times {\mathrm{319541}}^1$

素因数の和:319552

約数の個数: 16

約数和(自身を含む): 28758780

約数和(自身を除く): 15977140

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 319541, 639082, 1278164, 1597705, 2556328, 3195410, 6390820, 12781640]

約数ペア:

[(1, 12781640), (2, 6390820), (4, 3195410), (5, 2556328), (8, 1597705), (10, 1278164), (20, 639082), (40, 319541)]