204138508 has 96 divisors (see below), whose sum is σ = 451584000. Its totient is φ = 80438400.

The previous prime is 204138463. The next prime is 204138577. The reversal of 204138508 is 805831402.

It is a self number, because there is not a number n which added to its sum of digits gives 204138508.

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 31 ways as a sum of consecutive naturals, for example, 1068693 + ... + 1068883.

It is an arithmetic number, because the mean of its divisors is an integer number (4704000).

Almost surely, 2^204138508 is an apocalyptic number.

204138508 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 204138508, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (225792000).

204138508 is an abundant number, since it is smaller than the sum of its proper divisors (247445492).

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

204138508 is a wasteful number, since it uses less digits than its factorization.

204138508 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276 (or 260 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 204138508 is about 14287.7047841842. The cubic root of 204138508 is about 588.8097309737.

The spelling of 204138508 in words is "two hundred four million, one hundred thirty-eight thousand, five hundred eight".