Find the number that can replace the question mark (?) in the series given below: 20, 62, 189, 571, 1718, ?

The next number is 5160.

The rule is next = term x 3 + a counter that increases by 1.

20 x 3 + 2 = 62, 62 x 3 + 3 = 189.

189 x 3 + 4 = 571, 571 x 3 + 5 = 1718.

1718 x 3 + 6 = 5160.