205023105 has 96 divisors (see below), whose sum is σ = 426816000. Its totient is φ = 90937728.

The previous prime is 205023101. The next prime is 205023109. The reversal of 205023105 is 501320502.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (205023101) and next prime (205023109).

It is not a de Polignac number, because 205023105 - 2² = 205023101 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (205023101) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 570916 + ... + 571274.

It is an arithmetic number, because the mean of its divisors is an integer number (4446000).

Almost surely, 2^205023105 is an apocalyptic number.

It is an amenable number.

205023105 is an abundant number, since it is smaller than the sum of its proper divisors (221792895).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

205023105 is a wasteful number, since it uses less digits than its factorization.

205023105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 428 (or 411 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 18.

The square root of 205023105 is about 14318.6279021420. The cubic root of 205023105 is about 589.6590052941.

Adding to 205023105 its reverse (501320502), we get a palindrome (706343607).

The spelling of 205023105 in words is "two hundred five million, twenty-three thousand, one hundred five".