19821680

素因数分解:

$2^4\times 5^1\times {\mathrm{247771}}^1$

素因数の和:247784

約数の個数: 20

約数和(自身を含む): 46085592

約数和(自身を除く): 26263912

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 247771, 495542, 991084, 1238855, 1982168, 2477710, 3964336, 4955420, 9910840, 19821680]

約数ペア:

[(1, 19821680), (2, 9910840), (4, 4955420), (5, 3964336), (8, 2477710), (10, 1982168), (16, 1238855), (20, 991084), (40, 495542), (80, 247771)]