204147 has 8 divisors (see below), whose sum is σ = 302480. Its totient is φ = 136080.

The previous prime is 204143. The next prime is 204151. The reversal of 204147 is 741402.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (204143) and next prime (204151).

It is not a de Polignac number, because 204147 - 2² = 204143 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (204143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3754 + ... + 3807.

It is an arithmetic number, because the mean of its divisors is an integer number (37810).

2²⁰⁴¹⁴⁷ is an apocalyptic number.

204147 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

204147 is a deficient number, since it is larger than the sum of its proper divisors (98333).

204147 is an equidigital number, since it uses as much as digits as its factorization.

204147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7570 (or 7564 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 18.

The square root of 204147 is about 451.8262940556. The cubic root of 204147 is about 58.8817895533.

Adding to 204147 its reverse (741402), we get a palindrome (945549).

It can be divided in two parts, 204 and 147, that added together give a triangular number (351 = T₂₆).

The spelling of 204147 in words is "two hundred four thousand, one hundred forty-seven", and thus it is an iban number.