20716265 has 4 divisors (see below), whose sum is σ = 24859524. Its totient is φ = 16573008.

The previous prime is 20716253. The next prime is 20716273. The reversal of 20716265 is 56261702.

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 9339136 + 11377129 = 3056^2 + 3373^2 .

It is a cyclic number.

It is not a de Polignac number, because 20716265 - 2¹⁰ = 20715241 is a prime.

It is a Duffinian 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, 2071622 + ... + 2071631.

It is an arithmetic number, because the mean of its divisors is an integer number (6214881).

Almost surely, 2^20716265 is an apocalyptic number.

It is an amenable number.

20716265 is a deficient number, since it is larger than the sum of its proper divisors (4143259).

20716265 is an equidigital number, since it uses as much as digits as its factorization.

20716265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4143258.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 20716265 is about 4551.5123860097. The cubic root of 20716265 is about 274.6442341612.

Adding to 20716265 its reverse (56261702), we get a palindrome (76977967).

The spelling of 20716265 in words is "twenty million, seven hundred sixteen thousand, two hundred sixty-five".