20660713 has 4 divisors (see below), whose sum is σ = 20696148. Its totient is φ = 20625280.

The previous prime is 20660701. The next prime is 20660743. The reversal of 20660713 is 31706602.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31706602 = 2 ⋅15853301.

It can be written as a sum of positive squares in 2 ways, for example, as 7469289 + 13191424 = 2733^2 + 3632^2 .

It is a cyclic number.

It is not a de Polignac number, because 20660713 - 2⁵ = 20660681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20660743) by changing a digit.

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, 16828 + ... + 18013.

It is an arithmetic number, because the mean of its divisors is an integer number (5174037).

Almost surely, 2^20660713 is an apocalyptic number.

It is an amenable number.

20660713 is a deficient number, since it is larger than the sum of its proper divisors (35435).

20660713 is an equidigital number, since it uses as much as digits as its factorization.

20660713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35434.

The product of its (nonzero) digits is 1512, while the sum is 25.

The square root of 20660713 is about 4545.4057024649. The cubic root of 20660713 is about 274.3985223268.

The spelling of 20660713 in words is "twenty million, six hundred sixty thousand, seven hundred thirteen".