20031323123 has 4 divisors (see below), whose sum is σ = 22892940720. Its totient is φ = 17169705528.

The previous prime is 20031323113. The next prime is 20031323131. The reversal of 20031323123 is 32132313002.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32132313002 = 2 ⋅16066156501.

It is a cyclic number.

It is not a de Polignac number, because 20031323123 - 2¹⁰ = 20031322099 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20031323095 and 20031323104.

It is not an unprimeable number, because it can be changed into a prime (20031323113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1430808788 + ... + 1430808801.

It is an arithmetic number, because the mean of its divisors is an integer number (5723235180).

Almost surely, 2^20031323123 is an apocalyptic number.

20031323123 is a deficient number, since it is larger than the sum of its proper divisors (2861617597).

20031323123 is an equidigital number, since it uses as much as digits as its factorization.

20031323123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2861617596.

The product of its (nonzero) digits is 648, while the sum is 20.

Adding to 20031323123 its reverse (32132313002), we get a palindrome (52163636125).

The spelling of 20031323123 in words is "twenty billion, thirty-one million, three hundred twenty-three thousand, one hundred twenty-three".