16620918 has 16 divisors (see below), whose sum is σ = 34140720. Its totient is φ = 5390496.

The previous prime is 16620913. The next prime is 16620931. The reversal of 16620918 is 81902661.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16620911) 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 7 ways as a sum of consecutive naturals, for example, 37213 + ... + 37656.

It is an arithmetic number, because the mean of its divisors is an integer number (2133795).

Almost surely, 2^16620918 is an apocalyptic number.

16620918 is an abundant number, since it is smaller than the sum of its proper divisors (17519802).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16620918 is a wasteful number, since it uses less digits than its factorization.

16620918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74911.

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 16620918 is about 4076.8760098880. The cubic root of 16620918 is about 255.2025457272.

The spelling of 16620918 in words is "sixteen million, six hundred twenty thousand, nine hundred eighteen".