204020123 has 4 divisors (see below), whose sum is σ = 205147488. Its totient is φ = 202892760.

The previous prime is 204019979. The next prime is 204020153. The reversal of 204020123 is 321020402.

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

It is a cyclic number.

It is not a de Polignac number, because 204020123 - 2¹⁰ = 204019099 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 204020098 and 204020107.

It is not an unprimeable number, because it can be changed into a prime (204020153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 563411 + ... + 563772.

It is an arithmetic number, because the mean of its divisors is an integer number (51286872).

Almost surely, 2^204020123 is an apocalyptic number.

204020123 is a deficient number, since it is larger than the sum of its proper divisors (1127365).

204020123 is a wasteful number, since it uses less digits than its factorization.

204020123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1127364.

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 204020123 is about 14283.5612856178. The cubic root of 204020123 is about 588.6958871595.

Adding to 204020123 its reverse (321020402), we get a palindrome (525040525).

The spelling of 204020123 in words is "two hundred four million, twenty thousand, one hundred twenty-three".