20190389 has 4 divisors (see below), whose sum is σ = 21068256. Its totient is φ = 19312524.

The previous prime is 20190371. The next prime is 20190421. The reversal of 20190389 is 98309102.

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 a de Polignac number, because none of the positive numbers 2^k-20190389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20190319) 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, 438899 + ... + 438944.

It is an arithmetic number, because the mean of its divisors is an integer number (5267064).

Almost surely, 2^20190389 is an apocalyptic number.

It is an amenable number.

20190389 is a deficient number, since it is larger than the sum of its proper divisors (877867).

20190389 is an equidigital number, since it uses as much as digits as its factorization.

20190389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 877866.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 20190389 is about 4493.3716739215. The cubic root of 20190389 is about 272.3003683339.

The spelling of 20190389 in words is "twenty million, one hundred ninety thousand, three hundred eighty-nine".