204051636 has 60 divisors (see below), whose sum is σ = 537441828. Its totient is φ = 67506048.

The previous prime is 204051623. The next prime is 204051637. The reversal of 204051636 is 636150402.

204051636 is a `hidden beast` number, since 20 + 4 + 0 + 5 + 1 + 636 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 59907600 + 144144036 = 7740^2 + 12006^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204051637) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 42090 + ... + 46686.

Almost surely, 2^204051636 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 204051636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (268720914).

204051636 is an abundant number, since it is smaller than the sum of its proper divisors (333390192).

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

204051636 is a wasteful number, since it uses less digits than its factorization.

204051636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4750 (or 4739 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 204051636 is about 14284.6643642754. The cubic root of 204051636 is about 588.7261956378.

The spelling of 204051636 in words is "two hundred four million, fifty-one thousand, six hundred thirty-six".