20138194 has 4 divisors (see below), whose sum is σ = 30207294. Its totient is φ = 10069096.

The previous prime is 20138191. The next prime is 20138197. The reversal of 20138194 is 49183102.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (20138191) and next prime (20138197).

It can be written as a sum of positive squares in only one way, i.e., 14160169 + 5978025 = 3763^2 + 2445^2 .

It is not an unprimeable number, because it can be changed into a prime (20138191) 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 as a sum of consecutive naturals, namely, 5034547 + ... + 5034550.

Almost surely, 2^20138194 is an apocalyptic number.

20138194 is a deficient number, since it is larger than the sum of its proper divisors (10069100).

20138194 is a wasteful number, since it uses less digits than its factorization.

20138194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10069099.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 20138194 is about 4487.5599160345. The cubic root of 20138194 is about 272.0655209083.

The spelling of 20138194 in words is "twenty million, one hundred thirty-eight thousand, one hundred ninety-four".