15,000,000
Note ' for 'million' there must be six digits/zeroes after the number.
1 = units
10 = ten
100 = hundred
1000 = thousand
10000 = tens of thousands
100000 = hundred of thousands
1000000 = million
10000000 = tens of millions
100000000 = hundreds of millions
1000000000 = thousands of millions ( billions).
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Boy, I hope that's 15 million in numbers, since I'm not about to write 15 million numbers. 15,000,000
It looks like 15/20, o, if you prefer, 15/20.
It is: 15 = XV
They are 15-16 digit numbers. Sometimes they are divided into segments. See here for examples (not real numbers of course): http://www.planetpdf.com/codecuts/pdfs/tutorial/CredCard.pdf
Look for square numbers that are factors of 540, like 36. The square root of 540 = 6 times the square root of 15.