19720040

素因数分解:

$2^3\times 5^1\times {\mathrm{493001}}^1$

素因数の和:493012

約数の個数: 16

約数和(自身を含む): 44370180

約数和(自身を除く): 24650140

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 493001, 986002, 1972004, 2465005, 3944008, 4930010, 9860020, 19720040]

約数ペア:

[(1, 19720040), (2, 9860020), (4, 4930010), (5, 3944008), (8, 2465005), (10, 1972004), (20, 986002), (40, 493001)]