20031023123 has 4 divisors (see below), whose sum is σ = 20110828248. Its totient is φ = 19951218000.

The previous prime is 20031023119. The next prime is 20031023137. The reversal of 20031023123 is 32132013002.

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 20031023123 - 2² = 20031023119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20031023323) 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, 39902186 + ... + 39902687.

It is an arithmetic number, because the mean of its divisors is an integer number (5027707062).

Almost surely, 2^20031023123 is an apocalyptic number.

20031023123 is a deficient number, since it is larger than the sum of its proper divisors (79805125).

20031023123 is an equidigital number, since it uses as much as digits as its factorization.

20031023123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79805124.

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

Adding to 20031023123 its reverse (32132013002), we get a palindrome (52163036125).

The spelling of 20031023123 in words is "twenty billion, thirty-one million, twenty-three thousand, one hundred twenty-three".