20660198 has 16 divisors (see below), whose sum is σ = 34452096. Its totient is φ = 9227520.

The previous prime is 20660197. The next prime is 20660203. The reversal of 20660198 is 89106602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20660197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12011 + ... + 13622.

It is an arithmetic number, because the mean of its divisors is an integer number (2153256).

Almost surely, 2^20660198 is an apocalyptic number.

20660198 is a deficient number, since it is larger than the sum of its proper divisors (13791898).

20660198 is a wasteful number, since it uses less digits than its factorization.

20660198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25679.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 20660198 is about 4545.3490515031. The cubic root of 20660198 is about 274.3962423730.

The spelling of 20660198 in words is "twenty million, six hundred sixty thousand, one hundred ninety-eight".