19818116 has 12 divisors (see below), whose sum is σ = 34719132. Its totient is φ = 9898368.

The previous prime is 19818103. The next prime is 19818137. The reversal of 19818116 is 61181891.

It can be written as a sum of positive squares in 2 ways, for example, as 3818116 + 16000000 = 1954^2 + 4000^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2696 + ... + 6848.

It is an arithmetic number, because the mean of its divisors is an integer number (2893261).

Almost surely, 2^19818116 is an apocalyptic number.

It is an amenable number.

19818116 is a deficient number, since it is larger than the sum of its proper divisors (14901016).

19818116 is a wasteful number, since it uses less digits than its factorization.

19818116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5350 (or 5348 counting only the distinct ones).

The product of its digits is 3456, while the sum is 35.

The square root of 19818116 is about 4451.7542609627. The cubic root of 19818116 is about 270.6164060407.

The spelling of 19818116 in words is "nineteen million, eight hundred eighteen thousand, one hundred sixteen".