20020020021011 has 4 divisors (see below), whose sum is σ = 20023363942152. Its totient is φ = 20016676099872.

The previous prime is 20020020020999. The next prime is 20020020021041. The reversal of 20020020021011 is 11012002002002.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20020020021011 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20020020020983 and 20020020021001.

It is not an unprimeable number, because it can be changed into a prime (20020020021041) 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, 1671951590 + ... + 1671963563.

It is an arithmetic number, because the mean of its divisors is an integer number (5005840985538).

Almost surely, 2^{20020020021011} is an apocalyptic number.

20020020021011 is a deficient number, since it is larger than the sum of its proper divisors (3343921141).

20020020021011 is an equidigital number, since it uses as much as digits as its factorization.

20020020021011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3343921140.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 20020020021011 its reverse (11012002002002), we get a palindrome (31032022023013).

The spelling of 20020020021011 in words is "twenty trillion, twenty billion, twenty million, twenty-one thousand, eleven".