19782440

素因数分解:

$2^3\times 5^1\times {\mathrm{494561}}^1$

素因数の和:494572

約数の個数: 16

約数和(自身を含む): 44510580

約数和(自身を除く): 24728140

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 494561, 989122, 1978244, 2472805, 3956488, 4945610, 9891220, 19782440]

約数ペア:

[(1, 19782440), (2, 9891220), (4, 4945610), (5, 3956488), (8, 2472805), (10, 1978244), (20, 989122), (40, 494561)]