We know that,
Republic day = 26th January 2020 and
Kalvi valarchi day = 15th July 2020
∵ 2020 is divisible by 4
∴ 2020 is a leap year(February 29).
∴ The number of days between republic day and kalvi valarchi day 2020
January - 5 days
February - 29 days
March - 31 days
April - 30 days
May - 31 days
June - 30 days
July - 14 days
Total = 170
Hence, the number of days between republic day and kalvi valarchi day 2020 is 170.