22008641 has 4 divisors (see below), whose sum is σ = 22156500. Its totient is φ = 21860784.

The previous prime is 22008619. The next prime is 22008653. The reversal of 22008641 is 14680022.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3690241 + 18318400 = 1921^2 + 4280^2 .

It is a cyclic number.

It is not a de Polignac number, because 22008641 - 2⁶ = 22008577 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (22008661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73706 + ... + 74003.

It is an arithmetic number, because the mean of its divisors is an integer number (5539125).

Almost surely, 2^22008641 is an apocalyptic number.

It is an amenable number.

22008641 is a deficient number, since it is larger than the sum of its proper divisors (147859).

22008641 is a wasteful number, since it uses less digits than its factorization.

22008641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147858.

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 22008641 is about 4691.3368030872. The cubic root of 22008641 is about 280.2406137512.

Adding to 22008641 its reverse (14680022), we get a palindrome (36688663).

The spelling of 22008641 in words is "twenty-two million, eight thousand, six hundred forty-one".