204020839 has 4 divisors (see below), whose sum is σ = 222568200. Its totient is φ = 185473480.

The previous prime is 204020821. The next prime is 204020851. The reversal of 204020839 is 938020402.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 204020839 - 2⁷ = 204020711 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 (204020819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9273664 + ... + 9273685.

It is an arithmetic number, because the mean of its divisors is an integer number (55642050).

Almost surely, 2^204020839 is an apocalyptic number.

204020839 is a deficient number, since it is larger than the sum of its proper divisors (18547361).

204020839 is a wasteful number, since it uses less digits than its factorization.

204020839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18547360.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 204020839 is about 14283.5863493732. The cubic root of 204020839 is about 588.6965758265.

The spelling of 204020839 in words is "two hundred four million, twenty thousand, eight hundred thirty-nine".