Presumably you mean in Roman numerals?
If so then it is: (IV)DCCXV
Numerals in brackets indicate multiplication by a thousand.
Hence: (IV)DCCXV = 4*1000+500+100+100+10+5 = 4715
It's already a numeric number
4020096 IS in numeric form.
8 in numeric numbers is VIII.
LXXV
Nineteen.
XCIV
(VIII)
MMMMMMMMMMMMMD
8,400
(XXII)
we write 5 in roman number like this :- V
A number must, surely, be numeric! I suggest writing it as 24000.