20466565 has 12 divisors (see below), whose sum is σ = 28569996. Its totient is φ = 14034048.

The previous prime is 20466497. The next prime is 20466577. The reversal of 20466565 is 56566402.

It can be written as a sum of positive squares in 2 ways, for example, as 16144324 + 4322241 = 4018^2 + 2079^2 .

It is not a de Polignac number, because 20466565 - 2⁷ = 20466437 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20466565.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41524 + ... + 42013.

It is an arithmetic number, because the mean of its divisors is an integer number (2380833).

Almost surely, 2^20466565 is an apocalyptic number.

It is an amenable number.

20466565 is a deficient number, since it is larger than the sum of its proper divisors (8103431).

20466565 is an equidigital number, since it uses as much as digits as its factorization.

20466565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83556 (or 83549 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 34.

The square root of 20466565 is about 4523.9987842616. The cubic root of 20466565 is about 273.5363114884.

The spelling of 20466565 in words is "twenty million, four hundred sixty-six thousand, five hundred sixty-five".