22431164 has 48 divisors (see below), whose sum is σ = 47663616. Its totient is φ = 9028800.

The previous prime is 22431163. The next prime is 22431169. The reversal of 22431164 is 46113422.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22431163) 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, 38999 + ... + 39569.

It is an arithmetic number, because the mean of its divisors is an integer number (992992).

Almost surely, 2^22431164 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22431164, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23831808).

22431164 is an abundant number, since it is smaller than the sum of its proper divisors (25232452).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

22431164 is a wasteful number, since it uses less digits than its factorization.

22431164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 666 (or 664 counting only the distinct ones).

The product of its digits is 1152, while the sum is 23.

The square root of 22431164 is about 4736.1549805723. The cubic root of 22431164 is about 282.0226160961.

Adding to 22431164 its reverse (46113422), we get a palindrome (68544586).

The spelling of 22431164 in words is "twenty-two million, four hundred thirty-one thousand, one hundred sixty-four".