204863871 has 16 divisors (see below), whose sum is σ = 292406400. Its totient is φ = 127192608.

The previous prime is 204863861. The next prime is 204863873. The reversal of 204863871 is 178368402.

It is not a de Polignac number, because 204863871 - 2⁹ = 204863359 is a prime.

It is a super-2 number, since 2×204863871² = 83938411282209282, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204863873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27096 + ... + 33821.

It is an arithmetic number, because the mean of its divisors is an integer number (18275400).

Almost surely, 2^204863871 is an apocalyptic number.

204863871 is a deficient number, since it is larger than the sum of its proper divisors (87542529).

204863871 is a wasteful number, since it uses less digits than its factorization.

204863871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60998.

The product of its (nonzero) digits is 64512, while the sum is 39.

The square root of 204863871 is about 14313.0664429395. The cubic root of 204863871 is about 589.5063101780.

The spelling of 204863871 in words is "two hundred four million, eight hundred sixty-three thousand, eight hundred seventy-one".