Cube of 20
20 cubed equals 8000. Cubes show up in volume calculations — a cube with side 20 holds 8000 cubic units.
Cubes carry the fingerprint of their base. The final digit of 8000 is 0 — always the cube of the base's own final digit. Divided by 9, a cube only ever leaves 0, 1 or 8, and 8000 leaves 8. The volume picture explains the name: a 20 × 20 floor of unit cubes holds 400 of them, and 20 such layers stack to 8000 — the shape itself is the exponent at work. The gaps grow like a parabola: 8000 − 6859 = 1141, which is 3 × 20 × 19 + 1 — each new layer wider than the last. Even base, even cube: 8000 keeps the parity of 20.
| Expression | Value |
|---|---|
| 20³ | 8000 |
Frequently asked questions
What is 20 cubed?
20 cubed is 8000, because 20 × 20 × 20 = 8000. The exponent 3 gives it the name "cube".
Why is it called a cube number?
Because it matches volume: a cube with side length 20 contains exactly 8000 unit cubes.
Is 8000 a perfect cube?
Yes — 8000 = 20³, so it is a perfect cube by definition.