There are 50,847,534 primes between 1 and 1,000,000,000.
They are: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, ..., 999999733, 999999739, 999999751, 999999757, 999999761, 999999797, 999999883, 999999893, 999999929, 999999937.
[I'll leave the other 50,847,514 for you to find.]
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There are 17,999 such numbers.
I think its more then 20
No.
Assuming that leading zeros are not permitted (that is the lowest ten digit number is 1 000 000 000), then there are 4 500 000 000 possible even numbers
The prime factorization of 6,000,000,000 is: 210 × 3 × 59.