66620 has 12 divisors (see below), whose sum is σ = 139944. Its totient is φ = 26640.

The previous prime is 66617. The next prime is 66629. The reversal of 66620 is 2666.

66620 is nontrivially palindromic in base 11.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 3331 = 66620 / (6 + 6 + 6 + 2 + 0).

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 66592 and 66601.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 66620.

It is not an unprimeable number, because it can be changed into a prime (66629) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1646 + ... + 1685.

It is an arithmetic number, because the mean of its divisors is an integer number (11662).

2⁶⁶⁶²⁰ is an apocalyptic number.

It is an amenable number.

66620 is an abundant number, since it is smaller than the sum of its proper divisors (73324).

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

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69972).

66620 is a wasteful number, since it uses less digits than its factorization.

66620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3340 (or 3338 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 66620 is about 258.1085043155. The cubic root of 66620 is about 40.5385498922.

It can be divided in two parts, 666 and 20, that added together give a palindrome (686).

The spelling of 66620 in words is "sixty-six thousand, six hundred twenty".