20011323231 has 12 divisors (see below), whose sum is σ = 29271134880. Its totient is φ = 13172009760.

The previous prime is 20011323229. The next prime is 20011323251. The reversal of 20011323231 is 13232311002.

It is not a de Polignac number, because 20011323231 - 2¹ = 20011323229 is a prime.

It is a super-2 number, since 2×20011323231² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011323251) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14071950 + ... + 14073371.

It is an arithmetic number, because the mean of its divisors is an integer number (2439261240).

Almost surely, 2^20011323231 is an apocalyptic number.

20011323231 is a deficient number, since it is larger than the sum of its proper divisors (9259811649).

20011323231 is a wasteful number, since it uses less digits than its factorization.

20011323231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28145406 (or 28145403 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 20011323231 its reverse (13232311002), we get a palindrome (33243634233).

The spelling of 20011323231 in words is "twenty billion, eleven million, three hundred twenty-three thousand, two hundred thirty-one".