caxtolli onnauhpoalli ipan caxtolli onnaui = 19 x 20 + 19.
400.

centzontli = 1 bunch of grass, or 1 tuft of hair.
800.

ometzontli = 2 x 400.
1200.

eitzontli = 3 x 400.
7600.

caxtolli onnauhtzontli = 19 x 400.
8000.