20203231111 has 6 divisors (see below), whose sum is σ = 23501717880. Its totient is φ = 17317055196.

The previous prime is 20203231093. The next prime is 20203231117. The reversal of 20203231111 is 11113230202.

It is not a de Polignac number, because 20203231111 - 2⁵ = 20203231079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20203231117) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 206155371 + ... + 206155468.

It is an arithmetic number, because the mean of its divisors is an integer number (3916952980).

Almost surely, 2^20203231111 is an apocalyptic number.

20203231111 is a deficient number, since it is larger than the sum of its proper divisors (3298486769).

20203231111 is an equidigital number, since it uses as much as digits as its factorization.

20203231111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 412310853 (or 412310846 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 20203231111 its reverse (11113230202), we get a palindrome (31316461313).

Subtracting from 20203231111 its reverse (11113230202), we obtain a palindrome (9090000909).

The spelling of 20203231111 in words is "twenty billion, two hundred three million, two hundred thirty-one thousand, one hundred eleven".