20565495 has 80 divisors (see below), whose sum is σ = 40772160. Its totient is φ = 9870336.

The previous prime is 20565463. The next prime is 20565509. The reversal of 20565495 is 59456502.

20565495 is a `hidden beast` number, since 2 + 0 + 565 + 4 + 95 = 666.

It is not a de Polignac number, because 20565495 - 2⁵ = 20565463 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 (17) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 199614 + ... + 199716.

It is an arithmetic number, because the mean of its divisors is an integer number (509652).

Almost surely, 2^20565495 is an apocalyptic number.

20565495 is a deficient number, since it is larger than the sum of its proper divisors (20206665).

20565495 is a wasteful number, since it uses less digits than its factorization.

20565495 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166 (or 157 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 36.

The square root of 20565495 is about 4534.9195141700. The cubic root of 20565495 is about 273.9763374881.

The spelling of 20565495 in words is "twenty million, five hundred sixty-five thousand, four hundred ninety-five".