20194389 has 6 divisors (see below), whose sum is σ = 29169686. Its totient is φ = 13462920.

The previous prime is 20194387. The next prime is 20194399. The reversal of 20194389 is 98349102.

It can be written as a sum of positive squares in only one way, i.e., 12659364 + 7535025 = 3558^2 + 2745^2 .

It is not a de Polignac number, because 20194389 - 2¹ = 20194387 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20194381) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1121902 + ... + 1121919.

Almost surely, 2^20194389 is an apocalyptic number.

It is an amenable number.

20194389 is a deficient number, since it is larger than the sum of its proper divisors (8975297).

20194389 is a wasteful number, since it uses less digits than its factorization.

20194389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2243827 (or 2243824 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 20194389 is about 4493.8167519382. The cubic root of 20194389 is about 272.3183493240.

The spelling of 20194389 in words is "twenty million, one hundred ninety-four thousand, three hundred eighty-nine".