A four-digit number that can be divisible by 45. The product of the number in the thousands place and the number in the ones place is equal to 20. The two-digit number composed of the number in the hundreds place and the number in the tens place is the smallest composite number among odd numbers. The product of the smallest composite number, what is the four-digit number?
一个四位数，能被45整除，千位上的数字与个位上的数字之积等于20，百位上的数字与十位上的数字组成的两位数是奇数中的最小合数与最小合数的积，这个四位数是多少．
<result>4_365</result>