ONE
ONE
ONE
THREE
THREE
ELEVEN
---------
TWENTY

If O, T and E are not zero, and all the letters have a distinct value, can you solve for the letters?

O=2, N=3, E=5, T=6, H=9, R=7, L=0, V=1, W=4, Y=8

Only then,
One + One + One + Three + Three + Eleven = Twenty
235 + 235 + 235 + 69755 + 69755 + 505153 = 645368