20680791 has 8 divisors (see below), whose sum is σ = 27672960. Its totient is φ = 13737912.

The previous prime is 20680787. The next prime is 20680811. The reversal of 20680791 is 19708602.

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

It is not a de Polignac number, because 20680791 - 2² = 20680787 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20680711) 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 7 ways as a sum of consecutive naturals, for example, 11331 + ... + 13028.

It is an arithmetic number, because the mean of its divisors is an integer number (3459120).

Almost surely, 2^20680791 is an apocalyptic number.

20680791 is a deficient number, since it is larger than the sum of its proper divisors (6992169).

20680791 is a wasteful number, since it uses less digits than its factorization.

20680791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24645.

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 20680791 is about 4547.6137698798. The cubic root of 20680791 is about 274.4873800191.

The spelling of 20680791 in words is "twenty million, six hundred eighty thousand, seven hundred ninety-one".