20198113018 has 8 divisors (see below), whose sum is σ = 30409799220. Its totient is φ = 10061513280.

The previous prime is 20198113007. The next prime is 20198113031. The reversal of 20198113018 is 81031189102.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 18759959089 + 1438153929 = 136967^2 + 37923^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18770943 + ... + 18772018.

Almost surely, 2^20198113018 is an apocalyptic number.

20198113018 is a deficient number, since it is larger than the sum of its proper divisors (10211686202).

20198113018 is a wasteful number, since it uses less digits than its factorization.

20198113018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37543232.

The product of its (nonzero) digits is 3456, while the sum is 34.

The spelling of 20198113018 in words is "twenty billion, one hundred ninety-eight million, one hundred thirteen thousand, eighteen".