20123232231 has 32 divisors (see below), whose sum is σ = 28984713408. Its totient is φ = 12371240960.

The previous prime is 20123232229. The next prime is 20123232257. The reversal of 20123232231 is 13223232102.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20123232231 - 2¹ = 20123232229 is a prime.

It is a super-2 number, since 2×20123232231² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20123232198 and 20123232207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20123232221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2149621 + ... + 2158961.

It is an arithmetic number, because the mean of its divisors is an integer number (905772294).

Almost surely, 2^20123232231 is an apocalyptic number.

20123232231 is a deficient number, since it is larger than the sum of its proper divisors (8861481177).

20123232231 is a wasteful number, since it uses less digits than its factorization.

20123232231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10211.

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 20123232231 its reverse (13223232102), we get a palindrome (33346464333).

The spelling of 20123232231 in words is "twenty billion, one hundred twenty-three million, two hundred thirty-two thousand, two hundred thirty-one".