It does mean that though.
23 letters used: a, b, c, d, e, f, g, h, i, l, m, n, o, p, q, r, s, t, u, v, w, x, and y
z does appear in zero but it is nowhere to be seen after that, and j & k are never used.
The smallest number to contain the 23 letters used in naming numbers is: one octillion one septillion one quadrillion one billion one million two thousand five hundred sixty-eight (1,001,000,000,001,000,001,001,002,568) do with this information what you will