20535791 has 2 divisors, whose sum is σ = 20535792. Its totient is φ = 20535790.

The previous prime is 20535737. The next prime is 20535797. The reversal of 20535791 is 19753502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20535791 - 2¹⁴ = 20519407 is a 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 (20535797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10267895 + 10267896.

It is an arithmetic number, because the mean of its divisors is an integer number (10267896).

Almost surely, 2^20535791 is an apocalyptic number.

20535791 is a deficient number, since it is larger than the sum of its proper divisors (1).

20535791 is an equidigital number, since it uses as much as digits as its factorization.

20535791 is an evil number, because the sum of its binary digits is even.

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

The square root of 20535791 is about 4531.6433001727. The cubic root of 20535791 is about 273.8443670129.

The spelling of 20535791 in words is "twenty million, five hundred thirty-five thousand, seven hundred ninety-one".