205015005 has 24 divisors (see below), whose sum is σ = 382695768. Its totient is φ = 100930176.

The previous prime is 205015003. The next prime is 205015009. The reversal of 205015005 is 500510502.

It can be written as a sum of positive squares in 4 ways, for example, as 1610361 + 203404644 = 1269^2 + 14262^2 .

It is not a de Polignac number, because 205015005 - 2¹ = 205015003 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205015001) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 174642 + ... + 175811.

It is an arithmetic number, because the mean of its divisors is an integer number (15945657).

Almost surely, 2^205015005 is an apocalyptic number.

It is an amenable number.

205015005 is a deficient number, since it is larger than the sum of its proper divisors (177680763).

205015005 is a wasteful number, since it uses less digits than its factorization.

205015005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 350477 (or 350474 counting only the distinct ones).

The product of its (nonzero) digits is 250, while the sum is 18.

The square root of 205015005 is about 14318.3450510176. The cubic root of 205015005 is about 589.6512398265.

Adding to 205015005 its reverse (500510502), we get a palindrome (705525507).

The spelling of 205015005 in words is "two hundred five million, fifteen thousand, five".