20565475 has 12 divisors (see below), whose sum is σ = 29144464. Its totient is φ = 14101920.

The previous prime is 20565463. The next prime is 20565509. The reversal of 20565475 is 57456502.

It is not a de Polignac number, because 20565475 - 2⁵ = 20565443 is a prime.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20565475.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 58584 + ... + 58933.

Almost surely, 2^20565475 is an apocalyptic number.

20565475 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20565475 is a deficient number, since it is larger than the sum of its proper divisors (8578989).

20565475 is a wasteful number, since it uses less digits than its factorization.

20565475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117534 (or 117529 counting only the distinct ones).

The product of its (nonzero) digits is 42000, while the sum is 34.

The square root of 20565475 is about 4534.9173090587. The cubic root of 20565475 is about 273.9762486738.

The spelling of 20565475 in words is "twenty million, five hundred sixty-five thousand, four hundred seventy-five".