19800008 has 16 divisors (see below), whose sum is σ = 37543500. Its totient is φ = 9788416.

The previous prime is 19799993. The next prime is 19800083. The reversal of 19800008 is 80000891.

It can be written as a sum of positive squares in 2 ways, for example, as 19731364 + 68644 = 4442^2 + 262^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 19800008.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13193 + ... + 14616.

Almost surely, 2^19800008 is an apocalyptic number.

It is an amenable number.

19800008 is a deficient number, since it is larger than the sum of its proper divisors (17743492).

19800008 is a wasteful number, since it uses less digits than its factorization.

19800008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27904 (or 27900 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 26.

The square root of 19800008 is about 4449.7199911905. The cubic root of 19800008 is about 270.5339593351.

Adding to 19800008 its reverse (80000891), we get a palindrome (99800899).

The spelling of 19800008 in words is "nineteen million, eight hundred thousand, eight".