20198188 has 12 divisors (see below), whose sum is σ = 35413560. Its totient is φ = 10080032.

The previous prime is 20198183. The next prime is 20198201. The reversal of 20198188 is 88189102.

It is not an unprimeable number, because it can be changed into a prime (20198183) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 2233 + ... + 6736.

It is an arithmetic number, because the mean of its divisors is an integer number (2951130).

Almost surely, 2^20198188 is an apocalyptic number.

It is an amenable number.

20198188 is a deficient number, since it is larger than the sum of its proper divisors (15215372).

20198188 is a wasteful number, since it uses less digits than its factorization.

20198188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9536 (or 9534 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 37.

The square root of 20198188 is about 4494.2394239738. The cubic root of 20198188 is about 272.3354245710.

It can be divided in two parts, 201 and 98188, that added together give a palindrome (98389).

The spelling of 20198188 in words is "twenty million, one hundred ninety-eight thousand, one hundred eighty-eight".