205320123 has 8 divisors (see below), whose sum is σ = 304178000. Its totient is φ = 136880064.

The previous prime is 205320121. The next prime is 205320151. The reversal of 205320123 is 321023502.

It is not a de Polignac number, because 205320123 - 2¹ = 205320121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 205320096 and 205320105.

It is not an unprimeable number, because it can be changed into a prime (205320121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3802198 + ... + 3802251.

It is an arithmetic number, because the mean of its divisors is an integer number (38022250).

Almost surely, 2^205320123 is an apocalyptic number.

205320123 is a deficient number, since it is larger than the sum of its proper divisors (98857877).

205320123 is an equidigital number, since it uses as much as digits as its factorization.

205320123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7604458 (or 7604452 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 205320123 is about 14328.9958824755. The cubic root of 205320123 is about 589.9436152187.

Adding to 205320123 its reverse (321023502), we get a palindrome (526343625).

The spelling of 205320123 in words is "two hundred five million, three hundred twenty thousand, one hundred twenty-three".