205306881 has 8 divisors (see below), whose sum is σ = 294799680. Its totient is φ = 126342672.

The previous prime is 205306867. The next prime is 205306883. The reversal of 205306881 is 188603502.

It is a happy number.

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

It is not a de Polignac number, because 205306881 - 2¹³ = 205298689 is a prime.

It is a super-2 number, since 2×205306881² = 84301830771896322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (205306883) 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, 2632101 + ... + 2632178.

It is an arithmetic number, because the mean of its divisors is an integer number (36849960).

Almost surely, 2^205306881 is an apocalyptic number.

It is an amenable number.

205306881 is a deficient number, since it is larger than the sum of its proper divisors (89492799).

205306881 is a wasteful number, since it uses less digits than its factorization.

205306881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5264295.

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 205306881 is about 14328.5338049641. The cubic root of 205306881 is about 589.9309322578.

The spelling of 205306881 in words is "two hundred five million, three hundred six thousand, eight hundred eighty-one".