I am assuming you have xl2007 for that many rows. I am also assuming that the
same methodology in xl2003 would work for xl2007.
CTRL+G, type in D1360000, this will select your section as needed. The
first cell, D1, will be the active cell. Type your formula (ex:
=RANDBETWEEN(1,20)), then, instead of pressing enter, press CTRL+ENTER, this
will enter your formula in the entire selection.