205102005 has 8 divisors (see below), whose sum is σ = 328163232. Its totient is φ = 109387728.

The previous prime is 205102003. The next prime is 205102021. The reversal of 205102005 is 500201502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 205102005 - 2¹ = 205102003 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15), and also a Moran number because the ratio is a prime number: 13673467 = 205102005 / (2 + 0 + 5 + 1 + 0 + 2 + 0 + 0 + 5).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205102003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6836719 + ... + 6836748.

It is an arithmetic number, because the mean of its divisors is an integer number (41020404).

Almost surely, 2^205102005 is an apocalyptic number.

It is an amenable number.

205102005 is a deficient number, since it is larger than the sum of its proper divisors (123061227).

205102005 is a wasteful number, since it uses less digits than its factorization.

205102005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13673475.

The product of its (nonzero) digits is 100, while the sum is 15.

The square root of 205102005 is about 14321.3827893818. The cubic root of 205102005 is about 589.7346360038.

Adding to 205102005 its reverse (500201502), we get a palindrome (705303507).

The spelling of 205102005 in words is "two hundred five million, one hundred two thousand, five".