204420457 has 4 divisors (see below), whose sum is σ = 204560896. Its totient is φ = 204280020.

The previous prime is 204420421. The next prime is 204420467. The reversal of 204420457 is 754024402.

It is a happy number.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204420457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (204420407) 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, 68013 + ... + 70954.

It is an arithmetic number, because the mean of its divisors is an integer number (51140224).

Almost surely, 2^204420457 is an apocalyptic number.

It is an amenable number.

204420457 is a deficient number, since it is larger than the sum of its proper divisors (140439).

204420457 is a wasteful number, since it uses less digits than its factorization.

204420457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140438.

The product of its (nonzero) digits is 8960, while the sum is 28.

The square root of 204420457 is about 14297.5682198058. The cubic root of 204420457 is about 589.0806874336.

Adding to 204420457 its reverse (754024402), we get a palindrome (958444859).

The spelling of 204420457 in words is "two hundred four million, four hundred twenty thousand, four hundred fifty-seven".