20991620

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{80737}}^1$

素因数の和:80759

約数の個数: 24

約数和(自身を含む): 47473944

約数和(自身を除く): 26482324

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 130, 260, 80737, 161474, 322948, 403685, 807370, 1049581, 1614740, 2099162, 4198324, 5247905, 10495810, 20991620]

約数ペア:

[(1, 20991620), (2, 10495810), (4, 5247905), (5, 4198324), (10, 2099162), (13, 1614740), (20, 1049581), (26, 807370), (52, 403685), (65, 322948), (130, 161474), (260, 80737)]