16720499 has 4 divisors (see below), whose sum is σ = 16740360. Its totient is φ = 16700640.

The previous prime is 16720481. The next prime is 16720511. The reversal of 16720499 is 99402761.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 16720499 - 2⁸ = 16720243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16720409) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8609 + ... + 10370.

It is an arithmetic number, because the mean of its divisors is an integer number (4185090).

Almost surely, 2^16720499 is an apocalyptic number.

16720499 is a deficient number, since it is larger than the sum of its proper divisors (19861).

16720499 is an equidigital number, since it uses as much as digits as its factorization.

16720499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19860.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 16720499 is about 4089.0706768164. The cubic root of 16720499 is about 255.7111967329.

The spelling of 16720499 in words is "sixteen million, seven hundred twenty thousand, four hundred ninety-nine".