684020 has 24 divisors (see below), whose sum is σ = 1499904. Its totient is φ = 261536.

The previous prime is 684017. The next prime is 684037. The reversal of 684020 is 20486.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 683983 and 684001.

It is a congruent number.

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, 284 + ... + 1203.

It is an arithmetic number, because the mean of its divisors is an integer number (62496).

2⁶⁸⁴⁰²⁰ is an apocalyptic number.

It is an amenable number.

684020 is an abundant number, since it is smaller than the sum of its proper divisors (815884).

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

684020 is a wasteful number, since it uses less digits than its factorization.

684020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1519 (or 1517 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 684020 is about 827.0550163079. The cubic root of 684020 is about 88.1095398998.

The spelling of 684020 in words is "six hundred eighty-four thousand, twenty".