There are 17,999 such numbers.
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Any number that is a multiple of 18 (that is, any number that is a whole number multiplied by 18)So:1x18=182x18=363x18=544x18=725x18=90etc...Because there is no limit to the size of the number we are multiplying by 18 (ie. 1 000 000 x 18 = 18 000 000) there are infinite numbers divisible by 18. However, not all numbers are divisible by 18, only those you can get by multiplying a whole number by 18.
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
1,234,567 2,345,678 3,456,789