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May 20th is the following days: Internet Valentine's Day, World Metrology Day, China Student Nutrition Day, National Breastfeeding Promotion Day.

520 is Internet language, homophonic to "I love you"; for example: 5201314, "I love you forever"; 520320179 "I love you and want to love you together". Because it is convenient on the Internet, 520 has become I love you. 520 has become a way of expression for many lovers, and even the wedding date is chosen on May 20th "520".

520 Internet Valentine's Day, which is the first fixed holiday in the virtual network world organized spontaneously by tens of thousands of netizens. From May 20th, 2010, netizens have their own holiday.

In addition, according to the difference between 0 and 1, 520 is a holiday set for women, while 521 is a holiday set for men. Similar to Valentine's Day and White Day.

It also has a special numerical meaning:

520 is an integer between 519 and 521. 520 is an even number, divisible by 2, and can be decomposed into 2*2*2*5*13. 521 is a prime number, not divisible by 2, and can be decomposed into 1*521.