20461165 has 4 divisors (see below), whose sum is σ = 24553404. Its totient is φ = 16368928.

The previous prime is 20461151. The next prime is 20461171. The reversal of 20461165 is 56116402.

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 6421156 + 14040009 = 2534^2 + 3747^2 .

It is a cyclic number.

It is not a de Polignac number, because 20461165 - 2⁹ = 20460653 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 2046112 + ... + 2046121.

It is an arithmetic number, because the mean of its divisors is an integer number (6138351).

Almost surely, 2^20461165 is an apocalyptic number.

It is an amenable number.

20461165 is a deficient number, since it is larger than the sum of its proper divisors (4092239).

20461165 is an equidigital number, since it uses as much as digits as its factorization.

20461165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4092238.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 20461165 is about 4523.4019277530. The cubic root of 20461165 is about 273.5122523134.

Adding to 20461165 its reverse (56116402), we get a palindrome (76577567).

The spelling of 20461165 in words is "twenty million, four hundred sixty-one thousand, one hundred sixty-five".