20965198 has 4 divisors (see below), whose sum is σ = 31447800. Its totient is φ = 10482598.

The previous prime is 20965193. The next prime is 20965249. The reversal of 20965198 is 89156902.

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

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 20965198.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20965193) 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 as a sum of consecutive naturals, namely, 5241298 + ... + 5241301.

It is an arithmetic number, because the mean of its divisors is an integer number (7861950).

Almost surely, 2^20965198 is an apocalyptic number.

20965198 is a deficient number, since it is larger than the sum of its proper divisors (10482602).

20965198 is a wasteful number, since it uses less digits than its factorization.

20965198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10482601.

The product of its (nonzero) digits is 38880, while the sum is 40.

The square root of 20965198 is about 4578.7769109228. The cubic root of 20965198 is about 275.7399268943.

The spelling of 20965198 in words is "twenty million, nine hundred sixty-five thousand, one hundred ninety-eight".