204720897 has 4 divisors (see below), whose sum is σ = 272961200. Its totient is φ = 136480596.

The previous prime is 204720883. The next prime is 204720899. The reversal of 204720897 is 798027402.

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 204720897 - 2⁶ = 204720833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (204720899) 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, 34120147 + ... + 34120152.

It is an arithmetic number, because the mean of its divisors is an integer number (68240300).

Almost surely, 2^204720897 is an apocalyptic number.

It is an amenable number.

204720897 is a deficient number, since it is larger than the sum of its proper divisors (68240303).

204720897 is an equidigital number, since it uses as much as digits as its factorization.

204720897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68240302.

The product of its (nonzero) digits is 56448, while the sum is 39.

The square root of 204720897 is about 14308.0710439947. The cubic root of 204720897 is about 589.3691399202.

The spelling of 204720897 in words is "two hundred four million, seven hundred twenty thousand, eight hundred ninety-seven".