204749920 has 24 divisors (see below), whose sum is σ = 483722064. Its totient is φ = 81899904.

The previous prime is 204749879. The next prime is 204749939. The reversal of 204749920 is 29947402.

It is a self number, because there is not a number n which added to its sum of digits gives 204749920.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 639684 + ... + 640003.

It is an arithmetic number, because the mean of its divisors is an integer number (20155086).

Almost surely, 2^204749920 is an apocalyptic number.

204749920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

204749920 is an abundant number, since it is smaller than the sum of its proper divisors (278972144).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

204749920 is a wasteful number, since it uses less digits than its factorization.

204749920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1279702 (or 1279694 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 204749920 is about 14309.0852258277. The cubic root of 204749920 is about 589.3969899549.

The spelling of 204749920 in words is "two hundred four million, seven hundred forty-nine thousand, nine hundred twenty".