205397087 has 12 divisors (see below), whose sum is σ = 247747536. Its totient is φ = 166786560.

The previous prime is 205397069. The next prime is 205397089. The reversal of 205397087 is 780793502.

It is not a de Polignac number, because 205397087 - 2¹² = 205392991 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205397089) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38114 + ... + 43167.

It is an arithmetic number, because the mean of its divisors is an integer number (20645628).

Almost surely, 2^205397087 is an apocalyptic number.

205397087 is a deficient number, since it is larger than the sum of its proper divisors (42350449).

205397087 is an equidigital number, since it uses as much as digits as its factorization.

205397087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81326 (or 81307 counting only the distinct ones).

The product of its (nonzero) digits is 105840, while the sum is 41.

The square root of 205397087 is about 14331.6812342446. The cubic root of 205397087 is about 590.0173192273.

The spelling of 205397087 in words is "two hundred five million, three hundred ninety-seven thousand, eighty-seven".