20131022123 has 4 divisors (see below), whose sum is σ = 20675103840. Its totient is φ = 19586940408.

The previous prime is 20131022111. The next prime is 20131022129. The reversal of 20131022123 is 32122013102.

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 20131022123 - 2³⁰ = 19057280299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20131022129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 272040803 + ... + 272040876.

It is an arithmetic number, because the mean of its divisors is an integer number (5168775960).

Almost surely, 2^20131022123 is an apocalyptic number.

20131022123 is a deficient number, since it is larger than the sum of its proper divisors (544081717).

20131022123 is an equidigital number, since it uses as much as digits as its factorization.

20131022123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 544081716.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 20131022123 its reverse (32122013102), we get a palindrome (52253035225).

The spelling of 20131022123 in words is "twenty billion, one hundred thirty-one million, twenty-two thousand, one hundred twenty-three".