16820003 has 8 divisors (see below), whose sum is σ = 17223648. Its totient is φ = 16421184.

The previous prime is 16819993. The next prime is 16820017. The reversal of 16820003 is 30002861.

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 16820003 - 2¹⁶ = 16754467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16820053) 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, 6401 + ... + 8637.

It is an arithmetic number, because the mean of its divisors is an integer number (2152956).

Almost surely, 2^16820003 is an apocalyptic number.

16820003 is a deficient number, since it is larger than the sum of its proper divisors (403645).

16820003 is a wasteful number, since it uses less digits than its factorization.

16820003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2413.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 16820003 is about 4101.2196966268. The cubic root of 16820003 is about 256.2174411935.

Adding to 16820003 its reverse (30002861), we get a palindrome (46822864).

The spelling of 16820003 in words is "sixteen million, eight hundred twenty thousand, three".