81103280

素因数分解:

$2^4\times 5^1\times {\mathrm{1013791}}^1$

素因数の和:1013804

約数の個数: 20

約数和(自身を含む): 188565312

約数和(自身を除く): 107462032

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 1013791, 2027582, 4055164, 5068955, 8110328, 10137910, 16220656, 20275820, 40551640, 81103280]

約数ペア:

[(1, 81103280), (2, 40551640), (4, 20275820), (5, 16220656), (8, 10137910), (10, 8110328), (16, 5068955), (20, 4055164), (40, 2027582), (80, 1013791)]