20355791 has 2 divisors, whose sum is σ = 20355792. Its totient is φ = 20355790.

The previous prime is 20355781. The next prime is 20355827. The reversal of 20355791 is 19755302.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20355791 - 2¹⁰ = 20354767 is a prime.

It is a Chen prime.

It is a plaindrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20355781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10177895 + 10177896.

It is an arithmetic number, because the mean of its divisors is an integer number (10177896).

Almost surely, 2^20355791 is an apocalyptic number.

20355791 is a deficient number, since it is larger than the sum of its proper divisors (1).

20355791 is an equidigital number, since it uses as much as digits as its factorization.

20355791 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9450, while the sum is 32.

The square root of 20355791 is about 4511.7392433517. The cubic root of 20355791 is about 273.0419190775.

The spelling of 20355791 in words is "twenty million, three hundred fifty-five thousand, seven hundred ninety-one".