20868791 has 8 divisors (see below), whose sum is σ = 21135600. Its totient is φ = 20603968.

The previous prime is 20868769. The next prime is 20868823. The reversal of 20868791 is 19786802.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20868791 - 2¹⁰ = 20867767 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 (20868761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33515 + ... + 34131.

It is an arithmetic number, because the mean of its divisors is an integer number (2641950).

Almost surely, 2^20868791 is an apocalyptic number.

20868791 is a deficient number, since it is larger than the sum of its proper divisors (266809).

20868791 is a wasteful number, since it uses less digits than its factorization.

20868791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 993.

The product of its (nonzero) digits is 48384, while the sum is 41.

The square root of 20868791 is about 4568.2371873623. The cubic root of 20868791 is about 275.3166204440.

The spelling of 20868791 in words is "twenty million, eight hundred sixty-eight thousand, seven hundred ninety-one".