18999980

素因数分解:

$2^2\times 5^1\times {\mathrm{43}}^1\times {\mathrm{22093}}^1$

素因数の和:22145

約数の個数: 24

約数和(自身を含む): 40829712

約数和(自身を除く): 21829732

約数列:

[1, 2, 4, 5, 10, 20, 43, 86, 172, 215, 430, 860, 22093, 44186, 88372, 110465, 220930, 441860, 949999, 1899998, 3799996, 4749995, 9499990, 18999980]

約数ペア:

[(1, 18999980), (2, 9499990), (4, 4749995), (5, 3799996), (10, 1899998), (20, 949999), (43, 441860), (86, 220930), (172, 110465), (215, 88372), (430, 44186), (860, 22093)]