64
18 is the only number (other than 0) that is twice the sum of its digits.
362x(3x6)
18
18 is the only number that matches these criteria.
Find the square root of M.
36 is twice the product of its digits multiplied. 3 times 6 equals 18, and 18 times 2 equals 36.
2,241 because you double the digits
18. 1+8=9 9x2=18
Yes, unless you include 0.
22621, 44742, 66863, 88984
8
No it is not. A Square number is one that can be expressed as the product of the same number twice. Ex: 49 is a square number 7 * 7 or 72