205138936 has 16 divisors (see below), whose sum is σ = 387185040. Its totient is φ = 101889600.

The previous prime is 205138907. The next prime is 205138937. The reversal of 205138936 is 639831502.

It is a junction number, because it is equal to n+sod(n) for n = 205138895 and 205138904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205138937) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83701 + ... + 86116.

It is an arithmetic number, because the mean of its divisors is an integer number (24199065).

Almost surely, 2^205138936 is an apocalyptic number.

It is an amenable number.

205138936 is a deficient number, since it is larger than the sum of its proper divisors (182046104).

205138936 is a wasteful number, since it uses less digits than its factorization.

205138936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169974 (or 169970 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 205138936 is about 14322.6720970635. The cubic root of 205138936 is about 589.7700300715.

The spelling of 205138936 in words is "two hundred five million, one hundred thirty-eight thousand, nine hundred thirty-six".