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The amount of time that American astronauts spent on space is about
["Thirteen million, five hundred seven thousand, eight hundred four"]
<span>=<span><span><span>3*3</span>*3</span>*3
</span></span><span>=<span>3^4
</span></span><span>=<span>81
81 is the answer</span></span>
It must end in a 0 for the number to be divisible by 10. The other 5 can go in any order, so 5 factorial (5!) = 5*4*3*2*1
120 numbers