686682020 has 48 divisors (see below), whose sum is σ = 1593260928. Its totient is φ = 247272960.

The previous prime is 686681993. The next prime is 686682077. The reversal of 686682020 is 20286686.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36086 + ... + 51725.

It is an arithmetic number, because the mean of its divisors is an integer number (33192936).

Almost surely, 2^686682020 is an apocalyptic number.

It is an amenable number.

686682020 is an abundant number, since it is smaller than the sum of its proper divisors (906578908).

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

686682020 is a wasteful number, since it uses less digits than its factorization.

686682020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87860 (or 87858 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 38.

The square root of 686682020 is about 26204.6182952548. The cubic root of 686682020 is about 882.2369140907.

The spelling of 686682020 in words is "six hundred eighty-six million, six hundred eighty-two thousand, twenty".