20323989 has 24 divisors (see below), whose sum is σ = 34461440. Its totient is φ = 11298528.

The previous prime is 20323969. The next prime is 20323999. The reversal of 20323989 is 98932302.

It is not a de Polignac number, because 20323989 - 2⁵ = 20323957 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 (20323909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2029 + ... + 6690.

Almost surely, 2^20323989 is an apocalyptic number.

It is an amenable number.

20323989 is a deficient number, since it is larger than the sum of its proper divisors (14137451).

20323989 is a wasteful number, since it uses less digits than its factorization.

20323989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8769 (or 8766 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 20323989 is about 4508.2135042609. The cubic root of 20323989 is about 272.8996531735.

It can be divided in two parts, 20323 and 989, that added together give a palindrome (21312).

The spelling of 20323989 in words is "twenty million, three hundred twenty-three thousand, nine hundred eighty-nine".