205605025 has 24 divisors (see below), whose sum is σ = 261840384. Its totient is φ = 160080000.

The previous prime is 205605019. The next prime is 205605031. The reversal of 205605025 is 520506502.

It is an interprime number because it is at equal distance from previous prime (205605019) and next prime (205605031).

It is not a de Polignac number, because 205605025 - 2³ = 205605017 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 273400 + ... + 274150.

It is an arithmetic number, because the mean of its divisors is an integer number (10910016).

Almost surely, 2^205605025 is an apocalyptic number.

205605025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

205605025 is a deficient number, since it is larger than the sum of its proper divisors (56235359).

205605025 is a wasteful number, since it uses less digits than its factorization.

205605025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1041 (or 1036 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 205605025 is about 14338.9338864506. The cubic root of 205605025 is about 590.2163574980.

The spelling of 205605025 in words is "two hundred five million, six hundred five thousand, twenty-five".