fix factor bug, #1609

[fieker]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.77%. Comparing base (a98b156) to head (bf0c9c5).
Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1610      +/-   ##
==========================================
- Coverage   75.82%   75.77%   -0.06%     
==========================================
  Files         362      362              
  Lines      113907   113909       +2     
==========================================
- Hits        86374    86311      -63     
- Misses      27533    27598      +65     

Files with missing lines	Coverage Δ
src/Misc/Integer.jl	65.01% <100.00%> (ø)

... and 29 files with indirect coverage changes