205120257 has 8 divisors (see below), whose sum is σ = 287888160. Its totient is φ = 129549600.

The previous prime is 205120231. The next prime is 205120271. The reversal of 205120257 is 752021502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 205120257 - 2¹² = 205116161 is a prime.

It is not an unprimeable number, because it can be changed into a prime (205120457) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1799244 + ... + 1799357.

It is an arithmetic number, because the mean of its divisors is an integer number (35986020).

Almost surely, 2^205120257 is an apocalyptic number.

It is an amenable number.

205120257 is a deficient number, since it is larger than the sum of its proper divisors (82767903).

205120257 is a wasteful number, since it uses less digits than its factorization.

205120257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3598623.

The product of its (nonzero) digits is 1400, while the sum is 24.

The square root of 205120257 is about 14322.0200041754. The cubic root of 205120257 is about 589.7521289537.

Adding to 205120257 its reverse (752021502), we get a palindrome (957141759).

The spelling of 205120257 in words is "two hundred five million, one hundred twenty thousand, two hundred fifty-seven".