What is God's Number in Rubik's world?

If you are into speedcubing, you must know that there is such a thing called the God's Number. It is not the number given by God (lol).

The God's Number refers to the maximum number of moves to solve every position of a Rubik's cube.

And the God's Number for 3x3 Rubik's cube is 20.

It is surprising to know that only 20 moves are required to solve a total number of 43,252,003,274,489,856,000 combinations.