20116565 has 16 divisors (see below), whose sum is σ = 27682560. Its totient is φ = 13747200.

The previous prime is 20116543. The next prime is 20116619. The reversal of 20116565 is 56561102.

It is not a de Polignac number, because 20116565 - 2¹⁴ = 20100181 is a prime.

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, 11765 + ... + 13365.

It is an arithmetic number, because the mean of its divisors is an integer number (1730160).

Almost surely, 2^20116565 is an apocalyptic number.

It is an amenable number.

20116565 is a deficient number, since it is larger than the sum of its proper divisors (7565995).

20116565 is a wasteful number, since it uses less digits than its factorization.

20116565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1972.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 20116565 is about 4485.1493843572. The cubic root of 20116565 is about 271.9680839498.

Adding to 20116565 its reverse (56561102), we get a palindrome (76677667).

The spelling of 20116565 in words is "twenty million, one hundred sixteen thousand, five hundred sixty-five".