20716853 has 4 divisors (see below), whose sum is σ = 20771328. Its totient is φ = 20662380.

The previous prime is 20716789. The next prime is 20716873. The reversal of 20716853 is 35861702.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20716853 - 2⁶ = 20716789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20716873) 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, 26663 + ... + 27428.

It is an arithmetic number, because the mean of its divisors is an integer number (5192832).

Almost surely, 2^20716853 is an apocalyptic number.

It is an amenable number.

20716853 is a deficient number, since it is larger than the sum of its proper divisors (54475).

20716853 is an equidigital number, since it uses as much as digits as its factorization.

20716853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54474.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 20716853 is about 4551.5769794655. The cubic root of 20716853 is about 274.6468325910.

The spelling of 20716853 in words is "twenty million, seven hundred sixteen thousand, eight hundred fifty-three".