205280957 has 16 divisors (see below), whose sum is σ = 247203840. Its totient is φ = 166657392.

The previous prime is 205280941. The next prime is 205280981. The reversal of 205280957 is 759082502.

It is a cyclic number.

It is not a de Polignac number, because 205280957 - 2⁴ = 205280941 is a prime.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 205280957.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205280917) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10394 + ... + 22772.

It is an arithmetic number, because the mean of its divisors is an integer number (15450240).

Almost surely, 2^205280957 is an apocalyptic number.

It is an amenable number.

205280957 is a deficient number, since it is larger than the sum of its proper divisors (41922883).

205280957 is a wasteful number, since it uses less digits than its factorization.

205280957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12512.

The product of its (nonzero) digits is 50400, while the sum is 38.

The square root of 205280957 is about 14327.6291479086. The cubic root of 205280957 is about 589.9061011153.

The spelling of 205280957 in words is "two hundred five million, two hundred eighty thousand, nine hundred fifty-seven".