20489239 has 8 divisors (see below), whose sum is σ = 21680000. Its totient is φ = 19309752.

The previous prime is 20489237. The next prime is 20489257. The reversal of 20489239 is 93298402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20489239 - 2¹ = 20489237 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20489198 and 20489207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20489237) 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 7 ways as a sum of consecutive naturals, for example, 1072 + ... + 6490.

It is an arithmetic number, because the mean of its divisors is an integer number (2710000).

It is a Poulet number, since it divides 2^20489238-1.

Almost surely, 2^20489239 is an apocalyptic number.

20489239 is a deficient number, since it is larger than the sum of its proper divisors (1190761).

20489239 is a wasteful number, since it uses less digits than its factorization.

20489239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5637.

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 20489239 is about 4526.5040594260. The cubic root of 20489239 is about 273.6372871263.

The spelling of 20489239 in words is "twenty million, four hundred eighty-nine thousand, two hundred thirty-nine".