22145204 has 6 divisors (see below), whose sum is σ = 38754114. Its totient is φ = 11072600.

The previous prime is 22145161. The next prime is 22145209. The reversal of 22145204 is 40254122.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 21641104 + 504100 = 4652^2 + 710^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22145209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2768147 + ... + 2768154.

It is an arithmetic number, because the mean of its divisors is an integer number (6459019).

Almost surely, 2^22145204 is an apocalyptic number.

It is an amenable number.

22145204 is a deficient number, since it is larger than the sum of its proper divisors (16608910).

22145204 is a wasteful number, since it uses less digits than its factorization.

22145204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5536305 (or 5536303 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 22145204 is about 4705.8691014519. The cubic root of 22145204 is about 280.8190473899.

Adding to 22145204 its reverse (40254122), we get a palindrome (62399326).

The spelling of 22145204 in words is "twenty-two million, one hundred forty-five thousand, two hundred four".