20031103231 has 4 divisors (see below), whose sum is σ = 20039773264. Its totient is φ = 20022433200.

The previous prime is 20031103207. The next prime is 20031103241. The reversal of 20031103231 is 13230113002.

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 20031103231 - 2²¹ = 20029006079 is a prime.

It is a super-2 number, since 2×20031103231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20031103241) 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, 4331550 + ... + 4336171.

It is an arithmetic number, because the mean of its divisors is an integer number (5009943316).

Almost surely, 2^20031103231 is an apocalyptic number.

20031103231 is a deficient number, since it is larger than the sum of its proper divisors (8670033).

20031103231 is an equidigital number, since it uses as much as digits as its factorization.

20031103231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8670032.

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 20031103231 its reverse (13230113002), we get a palindrome (33261216233).

The spelling of 20031103231 in words is "twenty billion, thirty-one million, one hundred three thousand, two hundred thirty-one".