20575105 has 4 divisors (see below), whose sum is σ = 24690132. Its totient is φ = 16460080.

The previous prime is 20575073. The next prime is 20575111. The reversal of 20575105 is 50157502.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5489649 + 15085456 = 2343^2 + 3884^2 .

It is not a de Polignac number, because 20575105 - 2⁵ = 20575073 is a prime.

It is a super-2 number, since 2×20575105² = 846669891522050, which contains 22 as substring.

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 20575105.

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 3 ways as a sum of consecutive naturals, for example, 2057506 + ... + 2057515.

It is an arithmetic number, because the mean of its divisors is an integer number (6172533).

Almost surely, 2^20575105 is an apocalyptic number.

It is an amenable number.

20575105 is a deficient number, since it is larger than the sum of its proper divisors (4115027).

20575105 is an equidigital number, since it uses as much as digits as its factorization.

20575105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4115026.

The product of its (nonzero) digits is 1750, while the sum is 25.

The square root of 20575105 is about 4535.9789461593. The cubic root of 20575105 is about 274.0190060874.

The spelling of 20575105 in words is "twenty million, five hundred seventy-five thousand, one hundred five".