205809048 has 24 divisors (see below), whose sum is σ = 557399700. Its totient is φ = 68602992.

The previous prime is 205809011. The next prime is 205809173. The reversal of 205809048 is 840908502.

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1429158 + ... + 1429301.

Almost surely, 2^205809048 is an apocalyptic number.

It is an amenable number.

205809048 is an abundant number, since it is smaller than the sum of its proper divisors (351590652).

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

205809048 is a wasteful number, since it uses less digits than its factorization.

205809048 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2858471 (or 2858464 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 205809048 is about 14346.0464240152. The cubic root of 205809048 is about 590.4115179413.

The spelling of 205809048 in words is "two hundred five million, eight hundred nine thousand, forty-eight".