204644020423 has 12 divisors (see below), whose sum is σ = 216276573288. Its totient is φ = 193608539280.

The previous prime is 204644020417. The next prime is 204644020447. The reversal of 204644020423 is 324020446402.

It is not a de Polignac number, because 204644020423 - 2¹³ = 204644012231 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 (204644020453) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 122073 + ... + 651298.

It is an arithmetic number, because the mean of its divisors is an integer number (18023047774).

Almost surely, 2^204644020423 is an apocalyptic number.

204644020423 is a deficient number, since it is larger than the sum of its proper divisors (11632552865).

204644020423 is an equidigital number, since it uses as much as digits as its factorization.

204644020423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 774142 (or 774123 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 31.

Adding to 204644020423 its reverse (324020446402), we get a palindrome (528664466825).

The spelling of 204644020423 in words is "two hundred four billion, six hundred forty-four million, twenty thousand, four hundred twenty-three".