22090644 has 36 divisors (see below), whose sum is σ = 57910944. Its totient is φ = 7363224.

The previous prime is 22090643. The next prime is 22090657. The reversal of 22090644 is 44609022.

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 (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22090643) 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, 10392 + ... + 12335.

Almost surely, 2^22090644 is an apocalyptic number.

It is an amenable number.

22090644 is an abundant number, since it is smaller than the sum of its proper divisors (35820300).

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

22090644 is a wasteful number, since it uses less digits than its factorization.

22090644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22746 (or 22732 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 22090644 is about 4700.0685101390. The cubic root of 22090644 is about 280.5882361318.

Adding to 22090644 its reverse (44609022), we get a palindrome (66699666).

The spelling of 22090644 in words is "twenty-two million, ninety thousand, six hundred forty-four".