19998040

素因数分解:

$2^3\times 5^1\times {\mathrm{23}}^1\times {\mathrm{21737}}^1$

素因数の和:21771

約数の個数: 32

約数和(自身を含む): 46954080

約数和(自身を除く): 26956040

約数列:

[1, 2, 4, 5, 8, 10, 20, 23, 40, 46, 92, 115, 184, 230, 460, 920, 21737, 43474, 86948, 108685, 173896, 217370, 434740, 499951, 869480, 999902, 1999804, 2499755, 3999608, 4999510, 9999020, 19998040]

約数ペア:

[(1, 19998040), (2, 9999020), (4, 4999510), (5, 3999608), (8, 2499755), (10, 1999804), (20, 999902), (23, 869480), (40, 499951), (46, 434740), (92, 217370), (115, 173896), (184, 108685), (230, 86948), (460, 43474), (920, 21737)]