18989860

素因数分解:

$2^2\times 5^1\times {\mathrm{431}}^1\times {\mathrm{2203}}^1$

素因数の和:2643

約数の個数: 24

約数和(自身を含む): 39989376

約数和(自身を除く): 20999516

約数列:

[1, 2, 4, 5, 10, 20, 431, 862, 1724, 2155, 2203, 4310, 4406, 8620, 8812, 11015, 22030, 44060, 949493, 1898986, 3797972, 4747465, 9494930, 18989860]

約数ペア:

[(1, 18989860), (2, 9494930), (4, 4747465), (5, 3797972), (10, 1898986), (20, 949493), (431, 44060), (862, 22030), (1724, 11015), (2155, 8812), (2203, 8620), (4310, 4406)]