16720516720 has 20 divisors (see below), whose sum is σ = 38875201560. Its totient is φ = 6688206656.

The previous prime is 16720516619. The next prime is 16720516739. The reversal of 16720516720 is 2761502761.

It is a tau number, because it is divible by the number of its divisors (20).

It is a self number, because there is not a number n which added to its sum of digits gives 16720516720.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104503150 + ... + 104503309.

It is an arithmetic number, because the mean of its divisors is an integer number (1943760078).

Almost surely, 2^16720516720 is an apocalyptic number.

16720516720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16720516720 is an abundant number, since it is smaller than the sum of its proper divisors (22154684840).

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

16720516720 is a wasteful number, since it uses less digits than its factorization.

16720516720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209006472 (or 209006466 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 37.

The spelling of 16720516720 in words is "sixteen billion, seven hundred twenty million, five hundred sixteen thousand, seven hundred twenty".