16620 has 24 divisors (see below), whose sum is σ = 46704. Its totient is φ = 4416.

The previous prime is 16619. The next prime is 16631. The reversal of 16620 is 2661.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a nialpdrome in base 12.

It is a self number, because there is not a number n which added to its sum of digits gives 16620.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79 + ... + 198.

It is an arithmetic number, because the mean of its divisors is an integer number (1946).

2¹⁶⁶²⁰ is an apocalyptic number.

16620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16620 is an abundant number, since it is smaller than the sum of its proper divisors (30084).

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 (23352).

16620 is a wasteful number, since it uses less digits than its factorization.

16620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289 (or 287 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 16620 is about 128.9185789559. The cubic root of 16620 is about 25.5197847225.

It can be divided in two parts, 16 and 620, that added together give a palindrome (636).

The spelling of 16620 in words is "sixteen thousand, six hundred twenty".