Hi Aspirant,
That is a really good score in the JEE-Mains 2020 January session. To calculate your rank, you can use this formula:
((100- your percentile) x no. of students)/100
Using this formula, your rank is 20,247. You can check your chances in colleges here:
JEE Main College Predictor – Know your College Admission Chances Based ...
Regular exam updates, QnA, Predictors, College Applications & E-books now on your Mobile