20898239 has 4 divisors (see below), whose sum is σ = 20908656. Its totient is φ = 20887824.

The previous prime is 20898223. The next prime is 20898257. The reversal of 20898239 is 93289802.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20898239 - 2⁴ = 20898223 is a prime.

It is a super-2 number, since 2×20898239² = 873472786602242, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20898196 and 20898205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20898209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1139 + ... + 6564.

It is an arithmetic number, because the mean of its divisors is an integer number (5227164).

Almost surely, 2^20898239 is an apocalyptic number.

20898239 is a deficient number, since it is larger than the sum of its proper divisors (10417).

20898239 is an equidigital number, since it uses as much as digits as its factorization.

20898239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10416.

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 20898239 is about 4571.4591762368. The cubic root of 20898239 is about 275.4460595558.

It can be divided in two parts, 2089 and 8239, that multiplied together give a palindrome (17211271).

The spelling of 20898239 in words is "twenty million, eight hundred ninety-eight thousand, two hundred thirty-nine".