655020 has 48 divisors (see below), whose sum is σ = 2039520. Its totient is φ = 174528.

The previous prime is 655013. The next prime is 655021. The reversal of 655020 is 20556.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 654984 and 655002.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 655020.

It is not an unprimeable number, because it can be changed into a prime (655021) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 67 + ... + 1146.

It is an arithmetic number, because the mean of its divisors is an integer number (42490).

2⁶⁵⁵⁰²⁰ is an apocalyptic number.

655020 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 655020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1019760).

655020 is an abundant number, since it is smaller than the sum of its proper divisors (1384500).

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

655020 is a wasteful number, since it uses less digits than its factorization.

655020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1231 (or 1223 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 18.

The square root of 655020 is about 809.3330587589. Note that the first 3 decimals coincide. The cubic root of 655020 is about 86.8463399414.

Adding to 655020 its reverse (20556), we get a palindrome (675576).

The spelling of 655020 in words is "six hundred fifty-five thousand, twenty".