204135644 has 12 divisors (see below), whose sum is σ = 358318968. Its totient is φ = 101758800.

The previous prime is 204135641. The next prime is 204135647. The reversal of 204135644 is 446531402.

It is an interprime number because it is at equal distance from previous prime (204135641) and next prime (204135647).

It is a super-2 number, since 2×204135644² = 83342722302589472, which contains 22 as substring.

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204135641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75767 + ... + 78414.

It is an arithmetic number, because the mean of its divisors is an integer number (29859914).

Almost surely, 2^204135644 is an apocalyptic number.

It is an amenable number.

204135644 is a deficient number, since it is larger than the sum of its proper divisors (154183324).

204135644 is a wasteful number, since it uses less digits than its factorization.

204135644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154516 (or 154514 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 29.

The square root of 204135644 is about 14287.6045577976. The cubic root of 204135644 is about 588.8069773548.

The spelling of 204135644 in words is "two hundred four million, one hundred thirty-five thousand, six hundred forty-four".