20225144 has 16 divisors (see below), whose sum is σ = 39145920. Its totient is φ = 9786240.

The previous prime is 20225143. The next prime is 20225147. The reversal of 20225144 is 44152202.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20225143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40529 + ... + 41024.

It is an arithmetic number, because the mean of its divisors is an integer number (2446620).

Almost surely, 2^20225144 is an apocalyptic number.

It is an amenable number.

20225144 is a deficient number, since it is larger than the sum of its proper divisors (18920776).

20225144 is a wasteful number, since it uses less digits than its factorization.

20225144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81590 (or 81586 counting only the distinct ones).

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

The square root of 20225144 is about 4497.2373742110. The cubic root of 20225144 is about 272.4565214138.

Adding to 20225144 its reverse (44152202), we get a palindrome (64377346).

The spelling of 20225144 in words is "twenty million, two hundred twenty-five thousand, one hundred forty-four".