20565193 has 4 divisors (see below), whose sum is σ = 22434768. Its totient is φ = 18695620.

The previous prime is 20565191. The next prime is 20565199. The reversal of 20565193 is 39156502.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20565193 - 2¹ = 20565191 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20565191) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 934771 + ... + 934792.

It is an arithmetic number, because the mean of its divisors is an integer number (5608692).

Almost surely, 2^20565193 is an apocalyptic number.

It is an amenable number.

20565193 is a deficient number, since it is larger than the sum of its proper divisors (1869575).

20565193 is a wasteful number, since it uses less digits than its factorization.

20565193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1869574.

The product of its (nonzero) digits is 8100, while the sum is 31.

The square root of 20565193 is about 4534.8862168747. The cubic root of 20565193 is about 273.9749963864.

The spelling of 20565193 in words is "twenty million, five hundred sixty-five thousand, one hundred ninety-three".