20198 has 4 divisors (see below), whose sum is σ = 30300. Its totient is φ = 10098.

The previous prime is 20183. The next prime is 20201. The reversal of 20198 is 89102.

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

20198 is a modest number, since divided by 198 gives 2 as remainder.

It is a nialpdrome in base 12.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5048 + ... + 5051.

It is an arithmetic number, because the mean of its divisors is an integer number (7575).

2²⁰¹⁹⁸ is an apocalyptic number.

20198 is a deficient number, since it is larger than the sum of its proper divisors (10102).

20198 is a wasteful number, since it uses less digits than its factorization.

20198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10101.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 20198 is about 142.1196678859. The cubic root of 20198 is about 27.2334579624.

The spelling of 20198 in words is "twenty thousand, one hundred ninety-eight".