Let's write numbers backwards[20 000]

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still a long long way to go...
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0100100000000011

and didnt you mean this;

XVMMMCDXXXVI

or am i missing something?
Small before big = substract, small after big = add.

XVIIICDXXXVI = ((XVIII-C)-D)XXXVI
XVIII=18
C(100)-18=82
D(500)-82=418
XXXVI=36
418+36=454

Fail! lol somehow you made the M's, I's.

18433.... Why people love to copmlicate their lives till exhaustion

一万八千432

18430

That doesn't matter

18428

18426

18424

18422

achtzehntausendvierhundertzwanzig

Quote from Cresthen

____
XVIII=18*1000=18000 (overlined letters mean thousands - see "Large Numbers" paragraph here), CD=500-100=400, XXX=30, VI=6
____
XVIIICDXXXVI=18436

18434

Did you edited your post?
No just kidding, i didnt noticed it. And yes i knew the overhead rule.

18419

That's where you get/arrive by complicating your lives