The number 20,000 can be written in Roman numerals as [XX] or as XX with a horizontal bar placed above it (which I cannot write with this keyboard).
It's already a numeric number
4020096 IS in numeric form.
8 in numeric numbers is VIII.
Nineteen.
LXXV
(XXII)
(VIII)
8,400
MMMMMMMMMMMMMD
XCIV
we write 5 in roman number like this :- V