20321223 has 16 divisors (see below), whose sum is σ = 29282400. Its totient is φ = 12461184.

The previous prime is 20321201. The next prime is 20321233. The reversal of 20321223 is 32212302.

It is not a de Polignac number, because 20321223 - 2⁶ = 20321159 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20321233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12865 + ... + 14357.

It is an arithmetic number, because the mean of its divisors is an integer number (1830150).

Almost surely, 2^20321223 is an apocalyptic number.

20321223 is a deficient number, since it is larger than the sum of its proper divisors (8961177).

20321223 is a wasteful number, since it uses less digits than its factorization.

20321223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1858.

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 20321223 is about 4507.9067204191. The cubic root of 20321223 is about 272.8872724890.

Adding to 20321223 its reverse (32212302), we get a palindrome (52533525).

The spelling of 20321223 in words is "twenty million, three hundred twenty-one thousand, two hundred twenty-three".