20GB as a power of 10 is 1010.30103
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The result is 4 x 1018 or 4,000,000,000,000,000,000
The storage space per minute varies a lot depending on the quality of the sound; but for a typical MP3, you can calculate about a MB per minute. That would give you about 30 MB for half an hour; in other words, much less than one GB.
3582 * 109 = 3.582 X 1012 ===========
The answer is five and twenty-three hundredths times ten to the negative seventh power.
twenty three divide ten is two point three