685020 has 72 divisors (see below), whose sum is σ = 2240784. Its totient is φ = 155904.

The previous prime is 685019. The next prime is 685031. The reversal of 685020 is 20586.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a nialpdrome in base 7.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2824 + ... + 3056.

It is an arithmetic number, because the mean of its divisors is an integer number (31122).

2⁶⁸⁵⁰²⁰ is an apocalyptic number.

685020 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 685020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1120392).

685020 is an abundant number, since it is smaller than the sum of its proper divisors (1555764).

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

685020 is a wasteful number, since it uses less digits than its factorization.

685020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259 (or 250 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 685020 is about 827.6593502160. The cubic root of 685020 is about 88.1524561097.

The spelling of 685020 in words is "six hundred eighty-five thousand, twenty".