18910715

素因数分解:

$5^1\times {\mathrm{17}}^2\times {\mathrm{23}}^1\times {\mathrm{569}}^1$

素因数の和:631

約数の個数: 24

約数和(自身を含む): 25198560

約数和(自身を除く): 6287845

約数列:

[1, 5, 17, 23, 85, 115, 289, 391, 569, 1445, 1955, 2845, 6647, 9673, 13087, 33235, 48365, 65435, 164441, 222479, 822205, 1112395, 3782143, 18910715]

約数ペア:

[(1, 18910715), (5, 3782143), (17, 1112395), (23, 822205), (85, 222479), (115, 164441), (289, 65435), (391, 48365), (569, 33235), (1445, 13087), (1955, 9673), (2845, 6647)]