686020 has 12 divisors (see below), whose sum is σ = 1440684. Its totient is φ = 274400.

The previous prime is 686011. The next prime is 686027. The reversal of 686020 is 20686.

It can be written as a sum of positive squares in 2 ways, for example, as 141376 + 544644 = 376^2 + 738^2 .

It is a junction number, because it is equal to n+sod(n) for n = 685982 and 686000.

It is not an unprimeable number, because it can be changed into a prime (686027) by changing a digit.

686020 is an untouchable number, because it is not equal to the sum of proper divisors of any 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 3 ways as a sum of consecutive naturals, for example, 17131 + ... + 17170.

It is an arithmetic number, because the mean of its divisors is an integer number (120057).

2⁶⁸⁶⁰²⁰ is an apocalyptic number.

It is an amenable number.

686020 is an abundant number, since it is smaller than the sum of its proper divisors (754664).

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

686020 is a wasteful number, since it uses less digits than its factorization.

686020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34310 (or 34308 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 686020 is about 828.2632431782. The cubic root of 686020 is about 88.1953305735.

The spelling of 686020 in words is "six hundred eighty-six thousand, twenty".