206687140 has 24 divisors (see below), whose sum is σ = 473501952. Its totient is φ = 75158880.

The previous prime is 206687123. The next prime is 206687167. The reversal of 206687140 is 41786602.

It is a junction number, because it is equal to n+sod(n) for n = 206687096 and 206687105.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 469524 + ... + 469963.

It is an arithmetic number, because the mean of its divisors is an integer number (19729248).

Almost surely, 2^206687140 is an apocalyptic number.

206687140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

206687140 is an abundant number, since it is smaller than the sum of its proper divisors (266814812).

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

206687140 is a wasteful number, since it uses less digits than its factorization.

206687140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 939507 (or 939505 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 206687140 is about 14376.6178220053. The cubic root of 206687140 is about 591.2499975417.

The spelling of 206687140 in words is "two hundred six million, six hundred eighty-seven thousand, one hundred forty".