Asked by Donna

how many digits does the number 20^18 have?
Answered by R_scott
2^18 * 10^18 ... 2^8 * 2^10 * 10^18 ... 256 * 1024 * 10^18
Answered by henry2,
The number 20 has 2 digits.
20*10^18 has 2 + 18 = 20 digits.

Answered by R_scott
henry2

20*10^18 ≠ 20^18
Answered by Reiny
20^18 = 2^18 * 10^18 , using the property: a^n * b^n = (ab)^n
2^18 = 262144, which has 6 digits
every time we multiply this by 10 we increase the number of digits by 1
so 20^18 has 24 digits
Answered by henry2,
oops!! I read the number wrong. I thought it was 20*10^18, but it is 20^18.
Sorry!!
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