20442839 has 8 divisors (see below), whose sum is σ = 20824320. Its totient is φ = 20063736.

The previous prime is 20442827. The next prime is 20442853. The reversal of 20442839 is 93824402.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20442839 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 (20442439) 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, 30692 + ... + 31350.

It is an arithmetic number, because the mean of its divisors is an integer number (2603040).

Almost surely, 2^20442839 is an apocalyptic number.

20442839 is a deficient number, since it is larger than the sum of its proper divisors (381481).

20442839 is an equidigital number, since it uses as much as digits as its factorization.

20442839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1189.

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 20442839 is about 4521.3757861961. The cubic root of 20442839 is about 273.4305710288.

The spelling of 20442839 in words is "twenty million, four hundred forty-two thousand, eight hundred thirty-nine".