20984440

素因数分解:

$2^3\times 5^1\times {\mathrm{197}}^1\times {\mathrm{2663}}^1$

素因数の和:2871

約数の個数: 32

約数和(自身を含む): 47472480

約数和(自身を除く): 26488040

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 197, 394, 788, 985, 1576, 1970, 2663, 3940, 5326, 7880, 10652, 13315, 21304, 26630, 53260, 106520, 524611, 1049222, 2098444, 2623055, 4196888, 5246110, 10492220, 20984440]

約数ペア:

[(1, 20984440), (2, 10492220), (4, 5246110), (5, 4196888), (8, 2623055), (10, 2098444), (20, 1049222), (40, 524611), (197, 106520), (394, 53260), (788, 26630), (985, 21304), (1576, 13315), (1970, 10652), (2663, 7880), (3940, 5326)]