The product of all the prime numbers less than 20is closest to which of the following powers of 10?a.10^9b.10^8c.10^7d.10^6e10^5

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The product of all the prime numbers less than 20
is closest to which of the following powers of 10?
a.10^9b.10^8c.10^7d.10^6e10^5

选C~
20以下的质数有2.3.5.7.11.13.17.19他们乘积为9699690最接近10的7次方