22643905 has 12 divisors (see below), whose sum is σ = 27662292. Its totient is φ = 17794400.

The previous prime is 22643903. The next prime is 22643909. The reversal of 22643905 is 50934622.

It can be written as a sum of positive squares in 2 ways, for example, as 2537649 + 20106256 = 1593^2 + 4484^2 .

It is not a de Polignac number, because 22643905 - 2¹ = 22643903 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22643903) 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, 16755 + ... + 18055.

It is an arithmetic number, because the mean of its divisors is an integer number (2305191).

Almost surely, 2^22643905 is an apocalyptic number.

It is an amenable number.

22643905 is a deficient number, since it is larger than the sum of its proper divisors (5018387).

22643905 is an equidigital number, since it uses as much as digits as its factorization.

22643905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1424 (or 1365 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 22643905 is about 4758.5612321373. The cubic root of 22643905 is about 282.9113958032.

The spelling of 22643905 in words is "twenty-two million, six hundred forty-three thousand, nine hundred five".