How does difficulty is defined for block '55798'?

How does difficulty is defined for block '55798'?

I know that the formula for calculating the difficulty is below -

Difficulty = T (max) / T
Where T (max) = 1d00ffff in decimal it is 486604799.

**enter image description here**

As you can see in the above screenshot the difficulty of block '55798' is 12.85. I'm trying to calculate this value using formula but getting the different result.

D = T (max) / T

When I put the correct values in the formula, It becomes like -

D = (486604799 / 471067731) = 1.03

I don't know why I'm getting the different difficulty. The correct value is 12.85. Can you please let me know the reason of this?

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