20452165 has 4 divisors (see below), whose sum is σ = 24542604. Its totient is φ = 16361728.

The previous prime is 20452147. The next prime is 20452169. The reversal of 20452165 is 56125402.

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 3944196 + 16507969 = 1986^2 + 4063^2 .

It is a cyclic number.

It is not a de Polignac number, because 20452165 - 2¹¹ = 20450117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20452169) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2045212 + ... + 2045221.

It is an arithmetic number, because the mean of its divisors is an integer number (6135651).

Almost surely, 2^20452165 is an apocalyptic number.

It is an amenable number.

20452165 is a deficient number, since it is larger than the sum of its proper divisors (4090439).

20452165 is an equidigital number, since it uses as much as digits as its factorization.

20452165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4090438.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 20452165 is about 4522.4069918573. The cubic root of 20452165 is about 273.4721442798.

Adding to 20452165 its reverse (56125402), we get a palindrome (76577567).

The spelling of 20452165 in words is "twenty million, four hundred fifty-two thousand, one hundred sixty-five".