204939681 has 16 divisors (see below), whose sum is σ = 288288000. Its totient is φ = 129141648.

The previous prime is 204939673. The next prime is 204939727. The reversal of 204939681 is 186939402.

It is not a de Polignac number, because 204939681 - 2³ = 204939673 is a prime.

It is a super-2 number, since 2×204939681² = 84000545696763522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (204939601) 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, 22770 + ... + 30468.

It is an arithmetic number, because the mean of its divisors is an integer number (18018000).

Almost surely, 2^204939681 is an apocalyptic number.

It is an amenable number.

204939681 is a deficient number, since it is larger than the sum of its proper divisors (83348319).

204939681 is a wasteful number, since it uses less digits than its factorization.

204939681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8188.

The product of its (nonzero) digits is 93312, while the sum is 42.

The square root of 204939681 is about 14315.7144774545. The cubic root of 204939681 is about 589.5790169331.

The spelling of 204939681 in words is "two hundred four million, nine hundred thirty-nine thousand, six hundred eighty-one".