22005816 has 32 divisors (see below), whose sum is σ = 62874240. Its totient is φ = 6287328.

The previous prime is 22005791. The next prime is 22005817. The reversal of 22005816 is 61850022.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22005817) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65326 + ... + 65661.

It is an arithmetic number, because the mean of its divisors is an integer number (1964820).

Almost surely, 2^22005816 is an apocalyptic number.

It is an amenable number.

22005816 is an abundant number, since it is smaller than the sum of its proper divisors (40868424).

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

22005816 is a wasteful number, since it uses less digits than its factorization.

22005816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131003 (or 130999 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 22005816 is about 4691.0357065365. The cubic root of 22005816 is about 280.2286228002.

Adding to 22005816 its reverse (61850022), we get a palindrome (83855838).

The spelling of 22005816 in words is "twenty-two million, five thousand, eight hundred sixteen".