205820099 has 2 divisors, whose sum is σ = 205820100. Its totient is φ = 205820098.

The previous prime is 205820093. The next prime is 205820177. The reversal of 205820099 is 990028502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 205820099 - 2¹² = 205816003 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (205820093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102910049 + 102910050.

It is an arithmetic number, because the mean of its divisors is an integer number (102910050).

Almost surely, 2^205820099 is an apocalyptic number.

205820099 is a deficient number, since it is larger than the sum of its proper divisors (1).

205820099 is an equidigital number, since it uses as much as digits as its factorization.

205820099 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 35.

The square root of 205820099 is about 14346.4315772250. The cubic root of 205820099 is about 590.4220852138.

The spelling of 205820099 in words is "two hundred five million, eight hundred twenty thousand, ninety-nine".