206687860 has 12 divisors (see below), whose sum is σ = 434044548. Its totient is φ = 82675136.

The previous prime is 206687839. The next prime is 206687951. The reversal of 206687860 is 68786602.

206687860 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 42745444 + 163942416 = 6538^2 + 12804^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5167177 + ... + 5167216.

It is an arithmetic number, because the mean of its divisors is an integer number (36170379).

Almost surely, 2^206687860 is an apocalyptic number.

206687860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

206687860 is an abundant number, since it is smaller than the sum of its proper divisors (227356688).

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

206687860 is a wasteful number, since it uses less digits than its factorization.

206687860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10334402 (or 10334400 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 43.

The square root of 206687860 is about 14376.6428626436. The cubic root of 206687860 is about 591.2506840858.

The spelling of 206687860 in words is "two hundred six million, six hundred eighty-seven thousand, eight hundred sixty".