16720045 has 16 divisors (see below), whose sum is σ = 20511792. Its totient is φ = 13081600.

The previous prime is 16720043. The next prime is 16720049. The reversal of 16720045 is 54002761.

It can be written as a sum of positive squares in 8 ways, for example, as 487204 + 16232841 = 698^2 + 4029^2 .

It is not a de Polignac number, because 16720045 - 2¹ = 16720043 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16720043) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56919 + ... + 57211.

It is an arithmetic number, because the mean of its divisors is an integer number (1281987).

Almost surely, 2^16720045 is an apocalyptic number.

It is an amenable number.

16720045 is a deficient number, since it is larger than the sum of its proper divisors (3791747).

16720045 is a wasteful number, since it uses less digits than its factorization.

16720045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 16720045 is about 4089.0151626033. The cubic root of 16720045 is about 255.7088823296.

The spelling of 16720045 in words is "sixteen million, seven hundred twenty thousand, forty-five".