20852839 has 4 divisors (see below), whose sum is σ = 23831824. Its totient is φ = 17873856.

The previous prime is 20852831. The next prime is 20852849. The reversal of 20852839 is 93825802.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20852839 - 2³ = 20852831 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20852798 and 20852807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20852831) 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 3 ways as a sum of consecutive naturals, for example, 1489482 + ... + 1489495.

It is an arithmetic number, because the mean of its divisors is an integer number (5957956).

Almost surely, 2^20852839 is an apocalyptic number.

20852839 is a deficient number, since it is larger than the sum of its proper divisors (2978985).

20852839 is an equidigital number, since it uses as much as digits as its factorization.

20852839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2978984.

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 20852839 is about 4566.4908846947. The cubic root of 20852839 is about 275.2464523440.

The spelling of 20852839 in words is "twenty million, eight hundred fifty-two thousand, eight hundred thirty-nine".