205023688 has 8 divisors (see below), whose sum is σ = 384419430. Its totient is φ = 102511840.

The previous prime is 205023653. The next prime is 205023691. The reversal of 205023688 is 886320502.

It can be written as a sum of positive squares in only one way, i.e., 201015684 + 4008004 = 14178^2 + 2002^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×205023688² = 84069425282242688, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12813973 + ... + 12813988.

Almost surely, 2^205023688 is an apocalyptic number.

It is an amenable number.

205023688 is a deficient number, since it is larger than the sum of its proper divisors (179395742).

205023688 is a wasteful number, since it uses less digits than its factorization.

205023688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25627967 (or 25627963 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 34.

The square root of 205023688 is about 14318.6482602234. The cubic root of 205023688 is about 589.6595642082.

The spelling of 205023688 in words is "two hundred five million, twenty-three thousand, six hundred eighty-eight".