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6620 = 225331

6620 has 12 divisors (see below), whose sum is σ = 13944. Its totient is φ = 2640.

The previous prime is 6619. The next prime is 6637. The reversal of 6620 is 266.

It is a hoax number, since the sum of its digits (14) coincides with the sum of the digits of its distinct prime factors.

It is a plaindrome in base 14.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 6595 and 6604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 146 + ... + 185.

It is an arithmetic number, because the mean of its divisors is an integer number (1162).

26620 is an apocalyptic number.

It is an amenable number.

6620 is an abundant number, since it is smaller than the sum of its proper divisors (7324).

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 (6972).

6620 is a wasteful number, since it uses less digits than its factorization.

6620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340 (or 338 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 6620 is about 81.3633824272. The cubic root of 6620 is about 18.7767026942.

Adding to 6620 its reverse (266), we get a palindrome (6886).

It can be divided in two parts, 6 and 620, that added together give a palindrome (626).

The spelling of 6620 in words is "six thousand, six hundred twenty".

Divisors: 1 2 4 5 10 20 331 662 1324 1655 3310 6620