20402231223 has 16 divisors (see below), whose sum is σ = 29720100096. Its totient is φ = 12346602240.

The previous prime is 20402231173. The next prime is 20402231231. The reversal of 20402231223 is 32213220402.

It is not a de Polignac number, because 20402231223 - 2⁸ = 20402230967 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20402231223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20402231263) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 437115 + ... + 481532.

It is an arithmetic number, because the mean of its divisors is an integer number (1857506256).

Almost surely, 2^20402231223 is an apocalyptic number.

20402231223 is a deficient number, since it is larger than the sum of its proper divisors (9317868873).

20402231223 is a wasteful number, since it uses less digits than its factorization.

20402231223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 919334.

The product of its (nonzero) digits is 1152, while the sum is 21.

Adding to 20402231223 its reverse (32213220402), we get a palindrome (52615451625).

The spelling of 20402231223 in words is "twenty billion, four hundred two million, two hundred thirty-one thousand, two hundred twenty-three".