The greatest divisor of two natural numbers is 7, the least common multiple is 84, and the sum of two natural numbers is 49?

21,28

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1. The natural number P has 9 divisors and the natural number Q has 10 divisors. The least common multiple of P and Q is 2800. What are Q and P? If it is understandable, I will adopt it
2. Find out not more than 300 of only 15 divisors of all natural numbers!
3. Natural numbers a and B are divisors of their least common multiple
4. Is there a natural number whose product of all true divisors equals itself?
5. The greatest common divisor of 36 and 24 is___ The least common multiple is___ ．
6. What is the greatest common factor of 8 and 64? What is the least common multiple?
7. The least common multiple of two integers is 140, the greatest common divisor is 4, and decimals cannot divide large numbers
8. There are two natural numbers whose least common multiple is 640 and the greatest common divisor is 8, but these two numbers are not divisible by each other. These two numbers are () and ()
9. There is a six digit a1989b which can be divided by 44. This six digit is () the difference between two natural numbers is 3, and their greatest common factor and least common multiple are 180 There is a six digit a1989b that can be divided by 44. This six digit is () The difference between two natural numbers is 3, and their greatest common factor and least common multiple are 180. These two numbers are () and ()
10. The greatest common divisor of two numbers is 15, the least common multiple is 180, and the large number is not a multiple of a decimal. What are the two numbers?
11. In & nbsp; 1, 2, 12, 37, and 51, odd numbers have______ Prime numbers have______ The total number is______ ．
12. 1. Which of 2; 18; 37; 51; 60; 153; 235 are prime numbers and which are composite numbers
13. On the concepts of multiple, factor, even number, odd number, prime number and composite number
14. The basic concepts of factor, multiple, odd number, even number, prime number and composite number in primary school mathematics books It's better not to offer a reward before 21:00. If it's OK, it's better to add Even after 21:00,
15. If the number within 20 is both prime and even, it is (), if it is combined and odd, it is ()
16. Sum of prime numbers within 200 odd even numbers This is the question in our classroom manual. Thank you
17. Among all the factors of 18, what is even and prime? What is odd or composite?
18. There are several prime numbers, composite numbers, odd numbers and even numbers in the factor of 18
19. In 12 factors, odd number has () even number has () prime number has () combined number has ()
20. In the factor of 12, what is odd, what is even, what is prime, what is composite