205678680 has 32 divisors (see below), whose sum is σ = 617036400. Its totient is φ = 54847616.

The previous prime is 205678679. The next prime is 205678691. The reversal of 205678680 is 86876502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 856875 + ... + 857114.

Almost surely, 2^205678680 is an apocalyptic number.

205678680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

205678680 is an abundant number, since it is smaller than the sum of its proper divisors (411357720).

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

205678680 is a wasteful number, since it uses less digits than its factorization.

205678680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1714003 (or 1713999 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 42.

The square root of 205678680 is about 14341.5020133876. The cubic root of 205678680 is about 590.2868278829.

The spelling of 205678680 in words is "two hundred five million, six hundred seventy-eight thousand, six hundred eighty".