81378340

素因数分解:

$2^2\times 5^1\times {\mathrm{491}}^1\times {\mathrm{8287}}^1$

素因数の和:8787

約数の個数: 24

約数和(自身を含む): 171263232

約数和(自身を除く): 89884892

約数列:

[1, 2, 4, 5, 10, 20, 491, 982, 1964, 2455, 4910, 8287, 9820, 16574, 33148, 41435, 82870, 165740, 4068917, 8137834, 16275668, 20344585, 40689170, 81378340]

約数ペア:

[(1, 81378340), (2, 40689170), (4, 20344585), (5, 16275668), (10, 8137834), (20, 4068917), (491, 165740), (982, 82870), (1964, 41435), (2455, 33148), (4910, 16574), (8287, 9820)]