204420261 has 4 divisors (see below), whose sum is σ = 272560352. Its totient is φ = 136280172.

The previous prime is 204420241. The next prime is 204420269. The reversal of 204420261 is 162024402.

204420261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 204420261 - 2⁶ = 204420197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204420269) 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, 34070041 + ... + 34070046.

It is an arithmetic number, because the mean of its divisors is an integer number (68140088).

Almost surely, 2^204420261 is an apocalyptic number.

It is an amenable number.

204420261 is a deficient number, since it is larger than the sum of its proper divisors (68140091).

204420261 is an equidigital number, since it uses as much as digits as its factorization.

204420261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68140090.

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 204420261 is about 14297.5613654917. The cubic root of 204420261 is about 589.0804991618.

Adding to 204420261 its reverse (162024402), we get a palindrome (366444663).

The spelling of 204420261 in words is "two hundred four million, four hundred twenty thousand, two hundred sixty-one".