Move Oldest Files First, 20 at a Time

Great site and appreciate everyone's help in advance, I'm far from a DOS guru but could someone help me with how I can Move the oldest files in a directory first to another folder but only do a certain number of files at a time, for example 20 at a time? I have an Oracle program parsing xml files but its unable to cope with a huge number of files at the same time (runs out of heap space) so want to move them in small numbers at a time, but the oldest first files first. A simple batch file would be great which I am happy to run as a scheduled task. Thanks again for any help

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