None. Catholics, particularly members of the clergy, are forbidden from joining the Masons.
Yes, they had many differences on matters of authority and doctrine. Some Popes were even excommunicated by Church Synods (or Councils) and other rival Popes were elected in their place, called Ante-Popes.
There have been no popes named Kenneth.
There have been no popes named Jude.
217 popes have been born in Italy.
There have been 117 Popes of the Coptic See of Alexandria (Orthodox)
As of April 2013 there have been 266 popes.
There have been 8 popes called Urban.
There have been a total of 265 popes including Peter.
There have been 13 popes called Leo, and there appears to be no dispute about the numbering, as is the case with a few of the popes. See links.
From Saint Peter to Pope Francis there have been 266 popes.
There have been 15 popes named Benedict. Pope Benedict X does not count as he was an antipope.