Not clear what you mean: Do you want a numeric array or a string? If it's numeric, there's no 020 but only 20. If you want string, you'll have to use cells. One possibility is:
cellfun(@(c)sprintf('%d',c),mat2cell(data,ones(size(data,1),1),size(data,2)),'uniform',false)
ans =
'202'
'000'
'020'
'0012'
If it's still numeric, you could do this:
sum(bsxfun(@times,data,10.^(size(data,2)-1:-1:0)),2)
ans =
202
0
20
12
