20716791 has 4 divisors (see below), whose sum is σ = 27622392. Its totient is φ = 13811192.

The previous prime is 20716789. The next prime is 20716873. The reversal of 20716791 is 19761702.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20716791 - 2¹ = 20716789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20716741) 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, 3452796 + ... + 3452801.

It is an arithmetic number, because the mean of its divisors is an integer number (6905598).

Almost surely, 2^20716791 is an apocalyptic number.

20716791 is a deficient number, since it is larger than the sum of its proper divisors (6905601).

20716791 is an equidigital number, since it uses as much as digits as its factorization.

20716791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6905600.

The product of its (nonzero) digits is 5292, while the sum is 33.

The square root of 20716791 is about 4551.5701686341. The cubic root of 20716791 is about 274.6465586093.

The spelling of 20716791 in words is "twenty million, seven hundred sixteen thousand, seven hundred ninety-one".