20626565 has 16 divisors (see below), whose sum is σ = 25401600. Its totient is φ = 16074240.

The previous prime is 20626547. The next prime is 20626589. The reversal of 20626565 is 56562602.

It is not a de Polignac number, because 20626565 - 2¹⁰ = 20625541 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 34136 + ... + 34734.

It is an arithmetic number, because the mean of its divisors is an integer number (1587600).

Almost surely, 2^20626565 is an apocalyptic number.

It is an amenable number.

20626565 is a deficient number, since it is larger than the sum of its proper divisors (4775035).

20626565 is an equidigital number, since it uses as much as digits as its factorization.

20626565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 772.

The product of its (nonzero) digits is 21600, while the sum is 32.

The square root of 20626565 is about 4541.6478287071. The cubic root of 20626565 is about 274.2472637874.

The spelling of 20626565 in words is "twenty million, six hundred twenty-six thousand, five hundred sixty-five".