204156403 has 12 divisors (see below), whose sum is σ = 226595824. Its totient is φ = 183783600.

The previous prime is 204156401. The next prime is 204156413. The reversal of 204156403 is 304651402.

It is not a de Polignac number, because 204156403 - 2¹ = 204156401 is a prime.

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (204156401) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4273 + ... + 20653.

Almost surely, 2^204156403 is an apocalyptic number.

204156403 is a deficient number, since it is larger than the sum of its proper divisors (22439421).

204156403 is a wasteful number, since it uses less digits than its factorization.

204156403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16506 (or 16495 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 204156403 is about 14288.3310082039. The cubic root of 204156403 is about 588.8269357013.

The spelling of 204156403 in words is "two hundred four million, one hundred fifty-six thousand, four hundred three".