20786797 has 2 divisors, whose sum is σ = 20786798. Its totient is φ = 20786796.

The previous prime is 20786761. The next prime is 20786807. The reversal of 20786797 is 79768702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16232841 + 4553956 = 4029^2 + 2134^2 .

It is a cyclic number.

It is not a de Polignac number, because 20786797 - 2⁷ = 20786669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20786747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10393398 + 10393399.

It is an arithmetic number, because the mean of its divisors is an integer number (10393399).

Almost surely, 2^20786797 is an apocalyptic number.

It is an amenable number.

20786797 is a deficient number, since it is larger than the sum of its proper divisors (1).

20786797 is an equidigital number, since it uses as much as digits as its factorization.

20786797 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 296352, while the sum is 46.

The square root of 20786797 is about 4559.2539959954. The cubic root of 20786797 is about 274.9555718861.

The spelling of 20786797 in words is "twenty million, seven hundred eighty-six thousand, seven hundred ninety-seven".