20855759 has 2 divisors, whose sum is σ = 20855760. Its totient is φ = 20855758.

The previous prime is 20855743. The next prime is 20855767. The reversal of 20855759 is 95755802.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20855759 - 2⁴ = 20855743 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20855789) 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 as a sum of consecutive naturals, namely, 10427879 + 10427880.

It is an arithmetic number, because the mean of its divisors is an integer number (10427880).

Almost surely, 2^20855759 is an apocalyptic number.

20855759 is a deficient number, since it is larger than the sum of its proper divisors (1).

20855759 is an equidigital number, since it uses as much as digits as its factorization.

20855759 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 126000, while the sum is 41.

The square root of 20855759 is about 4566.8105938390. The cubic root of 20855759 is about 275.2592992299.

The spelling of 20855759 in words is "twenty million, eight hundred fifty-five thousand, seven hundred fifty-nine".