205020791 has 2 divisors, whose sum is σ = 205020792. Its totient is φ = 205020790.

The previous prime is 205020733. The next prime is 205020797. The reversal of 205020791 is 197020502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 205020791 - 2¹⁰ = 205019767 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 205020791.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205020797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102510395 + 102510396.

It is an arithmetic number, because the mean of its divisors is an integer number (102510396).

Almost surely, 2^205020791 is an apocalyptic number.

205020791 is a deficient number, since it is larger than the sum of its proper divisors (1).

205020791 is an equidigital number, since it uses as much as digits as its factorization.

205020791 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1260, while the sum is 26.

The square root of 205020791 is about 14318.5470980823. The cubic root of 205020791 is about 589.6567868839.

The spelling of 205020791 in words is "two hundred five million, twenty thousand, seven hundred ninety-one".