22431204 has 36 divisors (see below), whose sum is σ = 57346380. Its totient is φ = 7392000.

The previous prime is 22431193. The next prime is 22431209. The reversal of 22431204 is 40213422.

It can be written as a sum of positive squares in 2 ways, for example, as 6749604 + 15681600 = 2598^2 + 3960^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (22431209) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 297 + ... + 6704.

It is an arithmetic number, because the mean of its divisors is an integer number (1592955).

Almost surely, 2^22431204 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 22431204, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28673190).

22431204 is an abundant number, since it is smaller than the sum of its proper divisors (34915176).

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

22431204 is a wasteful number, since it uses less digits than its factorization.

22431204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7100 (or 7095 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 22431204 is about 4736.1592034052. The cubic root of 22431204 is about 282.0227837333.

Adding to 22431204 its reverse (40213422), we get a palindrome (62644626).

The spelling of 22431204 in words is "twenty-two million, four hundred thirty-one thousand, two hundred four".