22001844 has 12 divisors (see below), whose sum is σ = 51337664. Its totient is φ = 7333944.

The previous prime is 22001821. The next prime is 22001851. The reversal of 22001844 is 44810022.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×22001844² = 968162278800672, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 22001844.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 916732 + ... + 916755.

Almost surely, 2^22001844 is an apocalyptic number.

It is an amenable number.

22001844 is an abundant number, since it is smaller than the sum of its proper divisors (29335820).

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

22001844 is a wasteful number, since it uses less digits than its factorization.

22001844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1833494 (or 1833492 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 21.

The square root of 22001844 is about 4690.6123267650. The cubic root of 22001844 is about 280.2117615749.

Adding to 22001844 its reverse (44810022), we get a palindrome (66811866).

The spelling of 22001844 in words is "twenty-two million, one thousand, eight hundred forty-four".