16720 has 40 divisors (see below), whose sum is σ = 44640. Its totient is φ = 5760.

The previous prime is 16703. The next prime is 16729. The reversal of 16720 is 2761.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 16694 and 16703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16729) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 871 + ... + 889.

It is an arithmetic number, because the mean of its divisors is an integer number (1116).

2¹⁶⁷²⁰ is an apocalyptic number.

16720 is a gapful number since it is divisible by the number (10) 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 16720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22320).

16720 is an abundant number, since it is smaller than the sum of its proper divisors (27920).

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

16720 is a wasteful number, since it uses less digits than its factorization.

16720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43 (or 37 counting only the distinct ones).

The product of its (nonzero) digits is 84, while the sum is 16.

The square root of 16720 is about 129.3058390020. The cubic root of 16720 is about 25.5708652926.

The spelling of 16720 in words is "sixteen thousand, seven hundred twenty".