204220423 has 4 divisors (see below), whose sum is σ = 222785928. Its totient is φ = 185654920.

The previous prime is 204220411. The next prime is 204220463. The reversal of 204220423 is 324022402.

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

It is not a de Polignac number, because 204220423 - 2¹³ = 204212231 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 204220423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204220463) 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, 9282736 + ... + 9282757.

It is an arithmetic number, because the mean of its divisors is an integer number (55696482).

Almost surely, 2^204220423 is an apocalyptic number.

204220423 is a deficient number, since it is larger than the sum of its proper divisors (18565505).

204220423 is a wasteful number, since it uses less digits than its factorization.

204220423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18565504.

The product of its (nonzero) digits is 768, while the sum is 19.

The square root of 204220423 is about 14290.5711222470. The cubic root of 204220423 is about 588.8884779964. Note that the first 3 decimals are identical.

Adding to 204220423 its reverse (324022402), we get a palindrome (528242825).

The spelling of 204220423 in words is "two hundred four million, two hundred twenty thousand, four hundred twenty-three".