204420217 has 4 divisors (see below), whose sum is σ = 211469220. Its totient is φ = 197371216.

The previous prime is 204420197. The next prime is 204420241. The reversal of 204420217 is 712024402.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 712024402 = 2 ⋅356012201.

It can be written as a sum of positive squares in 2 ways, for example, as 75620416 + 128799801 = 8696^2 + 11349^2 .

It is a de Polignac number, because none of the positive numbers 2^k-204420217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (204420287) 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, 3524458 + ... + 3524515.

It is an arithmetic number, because the mean of its divisors is an integer number (52867305).

Almost surely, 2^204420217 is an apocalyptic number.

It is an amenable number.

204420217 is a deficient number, since it is larger than the sum of its proper divisors (7049003).

204420217 is an equidigital number, since it uses as much as digits as its factorization.

204420217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7049002.

The product of its (nonzero) digits is 896, while the sum is 22.

The square root of 204420217 is about 14297.5598267676. The cubic root of 204420217 is about 589.0804568967.

Adding to 204420217 its reverse (712024402), we get a palindrome (916444619).

The spelling of 204420217 in words is "two hundred four million, four hundred twenty thousand, two hundred seventeen".