205420237 has 8 divisors (see below), whose sum is σ = 224359200. Its totient is φ = 186525360.

The previous prime is 205420223. The next prime is 205420247. The reversal of 205420237 is 732024502.

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

It is a cyclic number.

It is not a de Polignac number, because 205420237 - 2¹⁹ = 204895949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205420207) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 862 + ... + 20287.

It is an arithmetic number, because the mean of its divisors is an integer number (28044900).

Almost surely, 2^205420237 is an apocalyptic number.

It is an amenable number.

205420237 is a deficient number, since it is larger than the sum of its proper divisors (18938963).

205420237 is a wasteful number, since it uses less digits than its factorization.

205420237 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22043.

The product of its (nonzero) digits is 3360, while the sum is 25.

The square root of 205420237 is about 14332.4888627202. The cubic root of 205420237 is about 590.0394850526.

Adding to 205420237 its reverse (732024502), we get a palindrome (937444739).

The spelling of 205420237 in words is "two hundred five million, four hundred twenty thousand, two hundred thirty-seven".