20323221 has 8 divisors (see below), whose sum is σ = 27609120. Its totient is φ = 13293072.

The previous prime is 20323201. The next prime is 20323267. The reversal of 20323221 is 12232302.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20323221 - 2⁶ = 20323157 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20323221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20323201) 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 7 ways as a sum of consecutive naturals, for example, 63751 + ... + 64068.

It is an arithmetic number, because the mean of its divisors is an integer number (3451140).

Almost surely, 2^20323221 is an apocalyptic number.

It is an amenable number.

20323221 is a deficient number, since it is larger than the sum of its proper divisors (7285899).

20323221 is a wasteful number, since it uses less digits than its factorization.

20323221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127875.

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

The square root of 20323221 is about 4508.1283255915. The cubic root of 20323221 is about 272.8962156991.

Adding to 20323221 its reverse (12232302), we get a palindrome (32555523).

It can be divided in two parts, 2032 and 3221, that added together give a triangular number (5253 = T₁₀₂).

The spelling of 20323221 in words is "twenty million, three hundred twenty-three thousand, two hundred twenty-one".