204253781 has 8 divisors (see below), whose sum is σ = 217950720. Its totient is φ = 190851552.

The previous prime is 204253771. The next prime is 204253783. The reversal of 204253781 is 187352402.

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 204253781 - 2⁶ = 204253717 is a prime.

It is a super-2 number, since 2×204253781² = 83439214105591922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204253783) 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 7 ways as a sum of consecutive naturals, for example, 72245 + ... + 75018.

It is an arithmetic number, because the mean of its divisors is an integer number (27243840).

Almost surely, 2^204253781 is an apocalyptic number.

It is an amenable number.

204253781 is a deficient number, since it is larger than the sum of its proper divisors (13696939).

204253781 is a wasteful number, since it uses less digits than its factorization.

204253781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147355.

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 204253781 is about 14291.7382077898. The cubic root of 204253781 is about 588.9205398768.

The spelling of 204253781 in words is "two hundred four million, two hundred fifty-three thousand, seven hundred eighty-one".