20020111111 has 64 divisors (see below), whose sum is σ = 27877893120. Its totient is φ = 13868144640.

The previous prime is 20020111091. The next prime is 20020111231. The reversal of 20020111111 is 11111102002.

It is not a de Polignac number, because 20020111111 - 2⁷ = 20020110983 is a prime.

20020111111 is a modest number, since divided by 111111 gives 20020 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20020114111) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 17213616 + ... + 17214778.

It is an arithmetic number, because the mean of its divisors is an integer number (435592080).

Almost surely, 2^20020111111 is an apocalyptic number.

20020111111 is a deficient number, since it is larger than the sum of its proper divisors (7857782009).

20020111111 is a wasteful number, since it uses less digits than its factorization.

20020111111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1816.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 20020111111 its reverse (11111102002), we get a palindrome (31131213113).

It can be divided in two parts, 20020 and 111111, that added together give a palindrome (131131).

The spelling of 20020111111 in words is "twenty billion, twenty million, one hundred eleven thousand, one hundred eleven".