16720065 has 24 divisors (see below), whose sum is σ = 29076840. Its totient is φ = 8888064.

The previous prime is 16720063. The next prime is 16720073. The reversal of 16720065 is 56002761.

16720065 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 144 + 16719921 = 12^2 + 4089^2 .

It is not a de Polignac number, because 16720065 - 2¹ = 16720063 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16720063) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25279 + ... + 25931.

It is an arithmetic number, because the mean of its divisors is an integer number (1211535).

Almost surely, 2^16720065 is an apocalyptic number.

16720065 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16720065 is a deficient number, since it is larger than the sum of its proper divisors (12356775).

16720065 is a wasteful number, since it uses less digits than its factorization.

16720065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1233 (or 1230 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 16720065 is about 4089.0176081793. The cubic root of 16720065 is about 255.7089842866.

The spelling of 16720065 in words is "sixteen million, seven hundred twenty thousand, sixty-five".