20873839 has 8 divisors (see below), whose sum is σ = 24183200. Its totient is φ = 17646336.

The previous prime is 20873821. The next prime is 20873843. The reversal of 20873839 is 93837802.

It is a happy number.

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 20873839 - 2⁷ = 20873711 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 (20873849) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19914 + ... + 20935.

It is an arithmetic number, because the mean of its divisors is an integer number (3022900).

Almost surely, 2^20873839 is an apocalyptic number.

20873839 is a deficient number, since it is larger than the sum of its proper divisors (3309361).

20873839 is an equidigital number, since it uses as much as digits as its factorization.

20873839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40929.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 20873839 is about 4568.7896646705. The cubic root of 20873839 is about 275.3388176452.

It can be divided in two parts, 20873 and 839, that added together give a palindrome (21712).

The spelling of 20873839 in words is "twenty million, eight hundred seventy-three thousand, eight hundred thirty-nine".