16720577 has 8 divisors (see below), whose sum is σ = 17049600. Its totient is φ = 16394400.

The previous prime is 16720573. The next prime is 16720591. The reversal of 16720577 is 77502761.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16720577 - 2² = 16720573 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16720573) 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 7 ways as a sum of consecutive naturals, for example, 13952 + ... + 15102.

It is an arithmetic number, because the mean of its divisors is an integer number (2131200).

Almost surely, 2^16720577 is an apocalyptic number.

It is an amenable number.

16720577 is a deficient number, since it is larger than the sum of its proper divisors (329023).

16720577 is a wasteful number, since it uses less digits than its factorization.

16720577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1423.

The product of its (nonzero) digits is 20580, while the sum is 35.

The square root of 16720577 is about 4089.0802144248. The cubic root of 16720577 is about 255.7115943574.

The spelling of 16720577 in words is "sixteen million, seven hundred twenty thousand, five hundred seventy-seven".