20123013231 has 12 divisors (see below), whose sum is σ = 29071817008. Its totient is φ = 13412922624.

The previous prime is 20123013217. The next prime is 20123013233. The reversal of 20123013231 is 13231032102.

20123013231 is a `hidden beast` number, since 201 + 230 + 1 + 3 + 231 = 666.

It is not a de Polignac number, because 20123013231 - 2⁹ = 20123012719 is a prime.

It is a super-2 number, since 2×20123013231² (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 (20123013233) 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, 148210 + ... + 249423.

Almost surely, 2^20123013231 is an apocalyptic number.

20123013231 is a deficient number, since it is larger than the sum of its proper divisors (8948803777).

20123013231 is a wasteful number, since it uses less digits than its factorization.

20123013231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 403262 (or 403259 counting only the distinct ones).

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

Adding to 20123013231 its reverse (13231032102), we get a palindrome (33354045333).

The spelling of 20123013231 in words is "twenty billion, one hundred twenty-three million, thirteen thousand, two hundred thirty-one".