1) Program to print first 20 natural numbers.2) Program to print even numbers uptoo 453) Program to print numbers from 1 to 25 along with its sqaures.4) Program to print numbers in counts of 10 upto 200.5) Program to print the following series 105,98,………7 using while loop.6) Program to print twenty whole numbers in reverse order.

Sure, here are the Python programs for your questions:

1. Program to print first 20 natural numbers.

for i in range(1, 21):
    print(i)

2. Program to print even numbers up to 45.

for i in range(2, 46, 2):
    print(i)

3. Program to print numbers from 1 to 25 along with its squares.

for i in range(1, 26):
    print(i, i**2)

4. Program to print numbers in counts of 10 up to 200.

for i in range(10, 201, 10):
    print(i)

5. Program to print the following series 105,98,………7 using while loop.

i = 105
while i >= 7:
    print(i)
    i -= 7

6. Program to print twenty whole numbers in reverse order.

for i in range(20, 0, -1):
    print(i)