Could you post all of your actual code in the post with the "code" tags. Then I can take an actual look for you.

Provisionally tho, what are you trying to do, calculate the interest? How is that done?

Doing what you did, you get the answer you should get.

2000 * 2.71828 = 5436.56
0.07 * 20 = 1.4
5439.56^1.4 = 169741.9863757396330986077861333

Meaning your logic is wrong, or you are using the wrong function.

As Math.pow(x,y); does

Returns the value of the first argument raised to the power of the second argument.

So, you are getting the answer you should get in the way the program works. Tell us how you are supposed to be actually getting the value and I'll do a solution.

You have not quite got the continuous compound interest formula correct.

Future Principal = Principal * (1 + NominalRate) ^ time

So in code you will have to do this.

temp4 = Math.pow(2.71828,rate);
temp5 = Math.pow(temp4,time);
answer = principal * temp5;

I believe in your example this should give.

temp4 = Math.pow(2.71828,0.07); = 1.0725081307
temp5 = Math.pow(1.0725081307,20); = 4.0551961480...
answer = 2000 * 4.0551961480; = 8110.3922960173...

Which is what you are looking for