205238090 has 8 divisors (see below), whose sum is σ = 369428580. Its totient is φ = 82095232.

The previous prime is 205238081. The next prime is 205238107. The reversal of 205238090 is 90832502.

It can be written as a sum of positive squares in 2 ways, for example, as 188485441 + 16752649 = 13729^2 + 4093^2 .

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

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10261895 + ... + 10261914.

Almost surely, 2^205238090 is an apocalyptic number.

205238090 is a deficient number, since it is larger than the sum of its proper divisors (164190490).

205238090 is a wasteful number, since it uses less digits than its factorization.

205238090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20523816.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 205238090 is about 14326.1331139983. The cubic root of 205238090 is about 589.8650366386.

The spelling of 205238090 in words is "two hundred five million, two hundred thirty-eight thousand, ninety".