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in the PONS Dictionary

fac·tor ['fæktəʳ] N

1. factor (contributing element):

factor
factor
to be a contributing factor in sth

2. factor math (number):

factor
two is a factor of six
by a factor of four
a factor 20 sunscreen

pro·'tec·tion fac·tor N

protection factor

'rhe·sus fac·tor N, 'Rh fac·tor N no pl

rhesus factor

sun pro·'tec·tion fac·tor N

to be a contributory factor to sth