20716393 has 4 divisors (see below), whose sum is σ = 21056068. Its totient is φ = 20376720.

The previous prime is 20716391. The next prime is 20716417. The reversal of 20716393 is 39361702.

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 3143529 + 17572864 = 1773^2 + 4192^2 .

It is a cyclic number.

It is not a de Polignac number, because 20716393 - 2¹ = 20716391 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20716391) 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, 169746 + ... + 169867.

It is an arithmetic number, because the mean of its divisors is an integer number (5264017).

Almost surely, 2^20716393 is an apocalyptic number.

It is an amenable number.

20716393 is a deficient number, since it is larger than the sum of its proper divisors (339675).

20716393 is an equidigital number, since it uses as much as digits as its factorization.

20716393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 339674.

The product of its (nonzero) digits is 6804, while the sum is 31.

The square root of 20716393 is about 4551.5264472482. The cubic root of 20716393 is about 274.6447998100.

It can be divided in two parts, 2071 and 6393, that added together give a square (8464 = 92²).

The spelling of 20716393 in words is "twenty million, seven hundred sixteen thousand, three hundred ninety-three".