18388520

素因数分解:

$2^3\times 5^1\times {\mathrm{43}}^1\times {\mathrm{10691}}^1$

素因数の和:10745

約数の個数: 32

約数和(自身を含む): 42340320

約数和(自身を除く): 23951800

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 43, 86, 172, 215, 344, 430, 860, 1720, 10691, 21382, 42764, 53455, 85528, 106910, 213820, 427640, 459713, 919426, 1838852, 2298565, 3677704, 4597130, 9194260, 18388520]

約数ペア:

[(1, 18388520), (2, 9194260), (4, 4597130), (5, 3677704), (8, 2298565), (10, 1838852), (20, 919426), (40, 459713), (43, 427640), (86, 213820), (172, 106910), (215, 85528), (344, 53455), (430, 42764), (860, 21382), (1720, 10691)]