205020797 has 2 divisors, whose sum is σ = 205020798. Its totient is φ = 205020796.

The previous prime is 205020791. The next prime is 205020839. The reversal of 205020797 is 797020502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 114789796 + 90231001 = 10714^2 + 9499^2 .

It is a cyclic number.

It is not a de Polignac number, because 205020797 - 2⁶ = 205020733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205020791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102510398 + 102510399.

It is an arithmetic number, because the mean of its divisors is an integer number (102510399).

Almost surely, 2^205020797 is an apocalyptic number.

It is an amenable number.

205020797 is a deficient number, since it is larger than the sum of its proper divisors (1).

205020797 is an equidigital number, since it uses as much as digits as its factorization.

205020797 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8820, while the sum is 32.

The square root of 205020797 is about 14318.5473076007. The cubic root of 205020797 is about 589.6567926361.

The spelling of 205020797 in words is "two hundred five million, twenty thousand, seven hundred ninety-seven".