20168998 has 4 divisors (see below), whose sum is σ = 30253500. Its totient is φ = 10084498.

The previous prime is 20168989. The next prime is 20169029. The reversal of 20168998 is 89986102.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

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 as a sum of consecutive naturals, namely, 5042248 + ... + 5042251.

It is an arithmetic number, because the mean of its divisors is an integer number (7563375).

Almost surely, 2^20168998 is an apocalyptic number.

20168998 is a deficient number, since it is larger than the sum of its proper divisors (10084502).

20168998 is a wasteful number, since it uses less digits than its factorization.

20168998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10084501.

The product of its (nonzero) digits is 62208, while the sum is 43.

The square root of 20168998 is about 4490.9907592869. The cubic root of 20168998 is about 272.2041701636.

The spelling of 20168998 in words is "twenty million, one hundred sixty-eight thousand, nine hundred ninety-eight".