22686561 has 20 divisors (see below), whose sum is σ = 34025200. Its totient is φ = 15064056.

The previous prime is 22686557. The next prime is 22686581. The reversal of 22686561 is 16568622.

It is not a de Polignac number, because 22686561 - 2² = 22686557 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 (22686541) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 30330 + ... + 31068.

It is an arithmetic number, because the mean of its divisors is an integer number (1701260).

Almost surely, 2^22686561 is an apocalyptic number.

It is an amenable number.

22686561 is a deficient number, since it is larger than the sum of its proper divisors (11338639).

22686561 is an equidigital number, since it uses as much as digits as its factorization.

22686561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1130 (or 1121 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 22686561 is about 4763.0411503576. The cubic root of 22686561 is about 283.0889314168.

The spelling of 22686561 in words is "twenty-two million, six hundred eighty-six thousand, five hundred sixty-one".