205420238 has 4 divisors (see below), whose sum is σ = 308130360. Its totient is φ = 102710118.

The previous prime is 205420223. The next prime is 205420247. The reversal of 205420238 is 832024502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 832024502 = 2 ⋅416012251.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51355058 + ... + 51355061.

It is an arithmetic number, because the mean of its divisors is an integer number (77032590).

Almost surely, 2^205420238 is an apocalyptic number.

205420238 is a deficient number, since it is larger than the sum of its proper divisors (102710122).

205420238 is a wasteful number, since it uses less digits than its factorization.

205420238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102710121.

The product of its (nonzero) digits is 3840, while the sum is 26.

The square root of 205420238 is about 14332.4888976060. The cubic root of 205420238 is about 590.0394860100.

The spelling of 205420238 in words is "two hundred five million, four hundred twenty thousand, two hundred thirty-eight".