20219389 has 4 divisors (see below), whose sum is σ = 20234880. Its totient is φ = 20203900.

The previous prime is 20219387. The next prime is 20219399. The reversal of 20219389 is 98391202.

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 20219389 - 2¹ = 20219387 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 (20219383) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5587 + ... + 8464.

It is an arithmetic number, because the mean of its divisors is an integer number (5058720).

Almost surely, 2^20219389 is an apocalyptic number.

It is an amenable number.

20219389 is a deficient number, since it is larger than the sum of its proper divisors (15491).

20219389 is a wasteful number, since it uses less digits than its factorization.

20219389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15490.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 20219389 is about 4496.5974914373. The cubic root of 20219389 is about 272.4306767518.

It can be divided in two parts, 202 and 19389, that added together give a palindrome (19591).

The spelling of 20219389 in words is "twenty million, two hundred nineteen thousand, three hundred eighty-nine".