20055389 has 4 divisors (see below), whose sum is σ = 20121024. Its totient is φ = 19989756.

The previous prime is 20055377. The next prime is 20055391. The reversal of 20055389 is 98355002.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20055389 - 2¹² = 20051293 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 (20055289) 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, 32357 + ... + 32970.

It is an arithmetic number, because the mean of its divisors is an integer number (5030256).

Almost surely, 2^20055389 is an apocalyptic number.

It is an amenable number.

20055389 is a deficient number, since it is larger than the sum of its proper divisors (65635).

20055389 is an equidigital number, since it uses as much as digits as its factorization.

20055389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65634.

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 20055389 is about 4478.3243518084. The cubic root of 20055389 is about 271.6921121527.

The spelling of 20055389 in words is "twenty million, fifty-five thousand, three hundred eighty-nine".