20706839 has 8 divisors (see below), whose sum is σ = 21003840. Its totient is φ = 20412000.

The previous prime is 20706823. The next prime is 20706869. The reversal of 20706839 is 93860702.

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 20706839 - 2⁴ = 20706823 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20706799 and 20706808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20706809) 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, 29189 + ... + 29889.

It is an arithmetic number, because the mean of its divisors is an integer number (2625480).

Almost surely, 2^20706839 is an apocalyptic number.

20706839 is a deficient number, since it is larger than the sum of its proper divisors (297001).

20706839 is a wasteful number, since it uses less digits than its factorization.

20706839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1081.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 20706839 is about 4550.4767882058. The cubic root of 20706839 is about 274.6025730270.

The spelling of 20706839 in words is "twenty million, seven hundred six thousand, eight hundred thirty-nine".