16720172 has 36 divisors (see below), whose sum is σ = 35526960. Its totient is φ = 6852384.

The previous prime is 16720157. The next prime is 16720177. The reversal of 16720172 is 27102761.

It is not an unprimeable number, because it can be changed into a prime (16720177) 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 11 ways as a sum of consecutive naturals, for example, 2654 + ... + 6362.

It is an arithmetic number, because the mean of its divisors is an integer number (986860).

Almost surely, 2^16720172 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16720172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17763480).

16720172 is an abundant number, since it is smaller than the sum of its proper divisors (18806788).

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

16720172 is a wasteful number, since it uses less digits than its factorization.

16720172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3750 (or 3741 counting only the distinct ones).

The product of its (nonzero) digits is 1176, while the sum is 26.

The square root of 16720172 is about 4089.0306919856. The cubic root of 16720172 is about 255.7095297550.

The spelling of 16720172 in words is "sixteen million, seven hundred twenty thousand, one hundred seventy-two".