22506905 has 4 divisors (see below), whose sum is σ = 27008292. Its totient is φ = 18005520.

The previous prime is 22506889. The next prime is 22506947. The reversal of 22506905 is 50960522.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50960522 = 2 ⋅25480261.

It can be written as a sum of positive squares in 2 ways, for example, as 8271376 + 14235529 = 2876^2 + 3773^2 .

It is not a de Polignac number, because 22506905 - 2⁴ = 22506889 is a prime.

It is a Duffinian number.

It is a Curzon 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, 2250686 + ... + 2250695.

It is an arithmetic number, because the mean of its divisors is an integer number (6752073).

Almost surely, 2^22506905 is an apocalyptic number.

It is an amenable number.

22506905 is a deficient number, since it is larger than the sum of its proper divisors (4501387).

22506905 is an equidigital number, since it uses as much as digits as its factorization.

22506905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4501386.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 22506905 is about 4744.1442853269. The cubic root of 22506905 is about 282.3396850607.

The spelling of 22506905 in words is "twenty-two million, five hundred six thousand, nine hundred five".