Let \(2^{\text{nd}\text{~}},8^{\text{th}\text{~}}\) and \(44^{\text{th}\text{~}}\) terms of a non-constant A. P. be respectively the \(1^{\text{st}\text{~}},2^{\text{nd}\text{~}}\) and \(3^{\text{rd}\text{~}}\) terms of a G. P. If the\\ first term of the A. P. is 1, then the sum of its first 20 terms is equal to\\