20312223123 has 32 divisors (see below), whose sum is σ = 28187596800. Its totient is φ = 12995136000.

The previous prime is 20312223109. The next prime is 20312223133. The reversal of 20312223123 is 32132221302.

It is a happy number.

It is not a de Polignac number, because 20312223123 - 2⁵ = 20312223091 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20312223123.

It is not an unprimeable number, because it can be changed into a prime (20312223133) 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, 11546718 + ... + 11548476.

It is an arithmetic number, because the mean of its divisors is an integer number (880862400).

Almost surely, 2^20312223123 is an apocalyptic number.

20312223123 is a deficient number, since it is larger than the sum of its proper divisors (7875373677).

20312223123 is a wasteful number, since it uses less digits than its factorization.

20312223123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2523.

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

Adding to 20312223123 its reverse (32132221302), we get a palindrome (52444444425).

The spelling of 20312223123 in words is "twenty billion, three hundred twelve million, two hundred twenty-three thousand, one hundred twenty-three".