Historically it was 20*230 = 21.5 billion bytes (approx). However, since around 2000, the binary prefix (10243 = 210)3 has been replaced by the metric prefix, 10003, so that nowadays 20GB is 20 billion bytes.
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1.27 GB = 1300.48 megabytes
1024 MB = 1 GB
One Gigabyte is equivalent to 1024 Megabytes.
The prefix giga means 10^9 in the International System of Units (SI), therefore, one Gigabyte is 1,000,000,000 bytes (one with nine zeroes). 1 gigabyte (GB) = 1 billion bytes.
Gb, Ab, Bb, Cb, Db, Eb, F, Gb