20123230031 has 4 divisors (see below), whose sum is σ = 20124585432. Its totient is φ = 20121874632.

The previous prime is 20123230027. The next prime is 20123230069. The reversal of 20123230031 is 13003232102.

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 20123230031 - 2² = 20123230027 is a prime.

It is a super-2 number, since 2×20123230031² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20123229991 and 20123230009.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20123230091) 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, 655181 + ... + 685206.

It is an arithmetic number, because the mean of its divisors is an integer number (5031146358).

Almost surely, 2^20123230031 is an apocalyptic number.

20123230031 is a deficient number, since it is larger than the sum of its proper divisors (1355401).

20123230031 is a wasteful number, since it uses less digits than its factorization.

20123230031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1355400.

The product of its (nonzero) digits is 216, while the sum is 17.

Adding to 20123230031 its reverse (13003232102), we get a palindrome (33126462133).

The spelling of 20123230031 in words is "twenty billion, one hundred twenty-three million, two hundred thirty thousand, thirty-one".