20552165 has 4 divisors (see below), whose sum is σ = 24662604. Its totient is φ = 16441728.

The previous prime is 20552149. The next prime is 20552171. The reversal of 20552165 is 56125502.

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 13060996 + 7491169 = 3614^2 + 2737^2 .

It is a cyclic number.

It is not a de Polignac number, because 20552165 - 2⁴ = 20552149 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2055212 + ... + 2055221.

It is an arithmetic number, because the mean of its divisors is an integer number (6165651).

Almost surely, 2^20552165 is an apocalyptic number.

It is an amenable number.

20552165 is a deficient number, since it is larger than the sum of its proper divisors (4110439).

20552165 is an equidigital number, since it uses as much as digits as its factorization.

20552165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4110438.

The product of its (nonzero) digits is 3000, while the sum is 26.

The square root of 20552165 is about 4533.4495695883. The cubic root of 20552165 is about 273.9171299995.

Adding to 20552165 its reverse (56125502), we get a palindrome (76677667).

The spelling of 20552165 in words is "twenty million, five hundred fifty-two thousand, one hundred sixty-five".