For an eight-digit number, the number in the tens place is 2, the number in the hundreds place is twice the number in the tens place, and the sum of the numbers of every three adjacent numbers is 9. What is this number?
一个八位数，十位上的数是2，百位上的数是十位的2倍，每相邻三个数位的数字之和是9，这个数是多少．
<result>23_423_423</result>