204642156 has 12 divisors (see below), whose sum is σ = 477498392. Its totient is φ = 68214048.

The previous prime is 204642091. The next prime is 204642157. The reversal of 204642156 is 651246402.

204642156 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (204642157) 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, 8526745 + ... + 8526768.

Almost surely, 2^204642156 is an apocalyptic number.

It is an amenable number.

204642156 is an abundant number, since it is smaller than the sum of its proper divisors (272856236).

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

204642156 is a wasteful number, since it uses less digits than its factorization.

204642156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17053520 (or 17053518 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 204642156 is about 14305.3191505817. The cubic root of 204642156 is about 589.2935679793.

Adding to 204642156 its reverse (651246402), we get a palindrome (855888558).

The spelling of 204642156 in words is "two hundred four million, six hundred forty-two thousand, one hundred fifty-six".