19780760

素因数分解:

$2^3\times 5^1\times {\mathrm{494519}}^1$

素因数の和:494530

約数の個数: 16

約数和(自身を含む): 44506800

約数和(自身を除く): 24726040

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 494519, 989038, 1978076, 2472595, 3956152, 4945190, 9890380, 19780760]

約数ペア:

[(1, 19780760), (2, 9890380), (4, 4945190), (5, 3956152), (8, 2472595), (10, 1978076), (20, 989038), (40, 494519)]