One million.
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There are 1,000,000 micrograms in a gram.
There are 1000000 micrograms in one gram. Therefore, 20 micrograms is equal to 20/1000000 = 0.00002 grams.
1 gram is equal to 1,000,000 micrograms (mcg).
One million micrograms1 gram = 1000000 micrograms1,000,000 micrograms in a gram
There are 1000 micrograms in a milligram. Therefore, here you need to divide by 1000. 100/1000 is 0.1 milligram.