204147745 has 4 divisors (see below), whose sum is σ = 244977300. Its totient is φ = 163318192.

The previous prime is 204147739. The next prime is 204147767. The reversal of 204147745 is 547741402.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 23970816 + 180176929 = 4896^2 + 13423^2 .

It is a cyclic number.

It is not a de Polignac number, because 204147745 - 2¹⁹ = 203623457 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 204147745.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20414770 + ... + 20414779.

It is an arithmetic number, because the mean of its divisors is an integer number (61244325).

Almost surely, 2^204147745 is an apocalyptic number.

It is an amenable number.

204147745 is a deficient number, since it is larger than the sum of its proper divisors (40829555).

204147745 is an equidigital number, since it uses as much as digits as its factorization.

204147745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40829554.

The product of its (nonzero) digits is 31360, while the sum is 34.

The square root of 204147745 is about 14288.0280304876. The cubic root of 204147745 is about 588.8186117961.

The spelling of 204147745 in words is "two hundred four million, one hundred forty-seven thousand, seven hundred forty-five".