I found a slick little script at the following URL for converting an SCN to decimal.
http://www.bluegecko.net/oracle/converting-hexadecimal-oracle-scns-to-decimal/
You can take the raw SCN and substitute it below…
scn=0x0623.02021908;echo $((${scn%%.*}*4294967296+0x${scn##*.}))