16520003 has 8 divisors (see below), whose sum is σ = 17307168. Its totient is φ = 15738624.

The previous prime is 16519999. The next prime is 16520027. The reversal of 16520003 is 30002561.

16520003 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 16520003 - 2² = 16519999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16520503) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5075 + ... + 7667.

It is an arithmetic number, because the mean of its divisors is an integer number (2163396).

Almost surely, 2^16520003 is an apocalyptic number.

16520003 is a deficient number, since it is larger than the sum of its proper divisors (787165).

16520003 is a wasteful number, since it uses less digits than its factorization.

16520003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2893.

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 16520003 is about 4064.4806556312. The cubic root of 16520003 is about 254.6850038497.

Adding to 16520003 its reverse (30002561), we get a palindrome (46522564).

The spelling of 16520003 in words is "sixteen million, five hundred twenty thousand, three".