20020911 has 4 divisors (see below), whose sum is σ = 26694552. Its totient is φ = 13347272.

The previous prime is 20020901. The next prime is 20020937. The reversal of 20020911 is 11902002.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20020911 - 2¹⁰ = 20019887 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20020901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3336816 + ... + 3336821.

It is an arithmetic number, because the mean of its divisors is an integer number (6673638).

Almost surely, 2^20020911 is an apocalyptic number.

20020911 is a deficient number, since it is larger than the sum of its proper divisors (6673641).

20020911 is an equidigital number, since it uses as much as digits as its factorization.

20020911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6673640.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 20020911 is about 4474.4732650894. The cubic root of 20020911 is about 271.5363306862.

Adding to 20020911 its reverse (11902002), we get a palindrome (31922913).

The spelling of 20020911 in words is "twenty million, twenty thousand, nine hundred eleven".