I want to make multiple title using one subplot, How can I do it?

I want titles above each individual image

for i = 1 : 20
  I = imread(my gallery folder images contain 20 images);
  subplot(5,5,i),imshow(I,[]);
  title('i'); 
end

% here my problem I want to make different title, every image with a title, but when I write title('i') , all images appears in one figure with the same title i