16820903 has 12 divisors (see below), whose sum is σ = 18876312. Its totient is φ = 14865120.

The previous prime is 16820897. The next prime is 16820929. The reversal of 16820903 is 30902861.

It is not a de Polignac number, because 16820903 - 2⁸ = 16820647 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 (16820303) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14501 + ... + 15617.

It is an arithmetic number, because the mean of its divisors is an integer number (1573026).

Almost surely, 2^16820903 is an apocalyptic number.

16820903 is a deficient number, since it is larger than the sum of its proper divisors (2055409).

16820903 is a wasteful number, since it uses less digits than its factorization.

16820903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1202 (or 1165 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 16820903 is about 4101.3294186154. The cubic root of 16820903 is about 256.2220109823. Note that the first 3 decimals are identical.

The spelling of 16820903 in words is "sixteen million, eight hundred twenty thousand, nine hundred three".