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##Haskell, 47
o m=sum[x|x<-[1..m-1],m`mod`x<1] f m=(o.o)m==m
Call the f function (for "friend"). Didn't provide a main because nobody else is doing so.
f
main
##Haskell, 4947
o m=sum[x|x<-[1..(m-1)]1],m`mod`x<1] f m=(o.o)m==m
##Haskell, 49
o m=sum[x|x<-[1..(m-1)],m`mod`x<1] f m=(o.o)m==m
