16620903 has 16 divisors (see below), whose sum is σ = 26518240. Its totient is φ = 10228032.

The previous prime is 16620899. The next prime is 16620911. The reversal of 16620903 is 30902661.

It is a happy number.

It is not a de Polignac number, because 16620903 - 2² = 16620899 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16620913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23326 + ... + 24027.

It is an arithmetic number, because the mean of its divisors is an integer number (1657390).

Almost surely, 2^16620903 is an apocalyptic number.

16620903 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

16620903 is a deficient number, since it is larger than the sum of its proper divisors (9897337).

16620903 is a wasteful number, since it uses less digits than its factorization.

16620903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47375 (or 47369 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 16620903 is about 4076.8741702437. The cubic root of 16620903 is about 255.2024689557.

The spelling of 16620903 in words is "sixteen million, six hundred twenty thousand, nine hundred three".