20736791 has 2 divisors, whose sum is σ = 20736792. Its totient is φ = 20736790.

The previous prime is 20736773. The next prime is 20736853. The reversal of 20736791 is 19763702.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20736791 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20736721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10368395 + 10368396.

It is an arithmetic number, because the mean of its divisors is an integer number (10368396).

Almost surely, 2^20736791 is an apocalyptic number.

20736791 is a deficient number, since it is larger than the sum of its proper divisors (1).

20736791 is an equidigital number, since it uses as much as digits as its factorization.

20736791 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15876, while the sum is 35.

The square root of 20736791 is about 4553.7666826486. The cubic root of 20736791 is about 274.7349114900.

The spelling of 20736791 in words is "twenty million, seven hundred thirty-six thousand, seven hundred ninety-one".