Answer:
23
Explanation:
1 milllion is a thousand
That's 10^6
10=2*5
1 million= 2⁶ times 5⁶ or 2*2*2*2*2*2*5*5*5*5*5*5
billion is 1000 times that so
That's 10⁹ so prime factors are 2⁹ times 5⁹ or
2*2*2*2*2*2*2*2*2*5*5*5*5*5*5*5*5*5
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