206105123 has 6 divisors (see below), whose sum is σ = 239754996. Its totient is φ = 176661492.

The previous prime is 206105111. The next prime is 206105147. The reversal of 206105123 is 321501602.

It is not a de Polignac number, because 206105123 - 2⁸ = 206104867 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 206105095 and 206105104.

It is not an unprimeable number, because it can be changed into a prime (206105173) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2103065 + ... + 2103162.

It is an arithmetic number, because the mean of its divisors is an integer number (39959166).

Almost surely, 2^206105123 is an apocalyptic number.

206105123 is a deficient number, since it is larger than the sum of its proper divisors (33649873).

206105123 is an equidigital number, since it uses as much as digits as its factorization.

206105123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4206241 (or 4206234 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 206105123 is about 14356.3617605576. The cubic root of 206105123 is about 590.6945024748.

Adding to 206105123 its reverse (321501602), we get a palindrome (527606725).

The spelling of 206105123 in words is "two hundred six million, one hundred five thousand, one hundred twenty-three".