19961680

素因数分解:

$2^4\times 5^1\times {\mathrm{249521}}^1$

素因数の和:249534

約数の個数: 20

約数和(自身を含む): 46411092

約数和(自身を除く): 26449412

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 249521, 499042, 998084, 1247605, 1996168, 2495210, 3992336, 4990420, 9980840, 19961680]

約数ペア:

[(1, 19961680), (2, 9980840), (4, 4990420), (5, 3992336), (8, 2495210), (10, 1996168), (16, 1247605), (20, 998084), (40, 499042), (80, 249521)]