18917420

素因数分解:

$2^2\times 5^1\times {\mathrm{43}}^1\times {\mathrm{21997}}^1$

素因数の和:22049

約数の個数: 24

約数和(自身を含む): 40652304

約数和(自身を除く): 21734884

約数列:

[1, 2, 4, 5, 10, 20, 43, 86, 172, 215, 430, 860, 21997, 43994, 87988, 109985, 219970, 439940, 945871, 1891742, 3783484, 4729355, 9458710, 18917420]

約数ペア:

[(1, 18917420), (2, 9458710), (4, 4729355), (5, 3783484), (10, 1891742), (20, 945871), (43, 439940), (86, 219970), (172, 109985), (215, 87988), (430, 43994), (860, 21997)]