20105198 has 4 divisors (see below), whose sum is σ = 30157800. Its totient is φ = 10052598.

The previous prime is 20105191. The next prime is 20105201. The reversal of 20105198 is 89150102.

It is a happy number.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20105191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5026298 + ... + 5026301.

It is an arithmetic number, because the mean of its divisors is an integer number (7539450).

Almost surely, 2^20105198 is an apocalyptic number.

20105198 is a deficient number, since it is larger than the sum of its proper divisors (10052602).

20105198 is a wasteful number, since it uses less digits than its factorization.

20105198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10052601.

The product of its (nonzero) digits is 720, while the sum is 26.

The square root of 20105198 is about 4483.8820234257. The cubic root of 20105198 is about 271.9168485015.

The spelling of 20105198 in words is "twenty million, one hundred five thousand, one hundred ninety-eight".