https://www.mathworks.com/help/matlab/ref/ceil.html - ceil() does the job.
a=[ 19.921920682316983 15.607883029893719 12.369945347943816 9.904715485705831 8.006173113714063 5.365552456501197 3.704171008046680 ];
b=ceil(a)
Gives:
b =
20 16 13 10 9 6 4
