20705339 has 4 divisors (see below), whose sum is σ = 20724480. Its totient is φ = 20686200.

The previous prime is 20705323. The next prime is 20705357. The reversal of 20705339 is 93350702.

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

It is a cyclic number.

It is not a de Polignac number, because 20705339 - 2⁴ = 20705323 is a prime.

It is a super-2 number, since 2×20705339² = 857422126209842, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20705309) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7844 + ... + 10145.

It is an arithmetic number, because the mean of its divisors is an integer number (5181120).

Almost surely, 2^20705339 is an apocalyptic number.

20705339 is a deficient number, since it is larger than the sum of its proper divisors (19141).

20705339 is a wasteful number, since it uses less digits than its factorization.

20705339 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19140.

The product of its (nonzero) digits is 5670, while the sum is 29.

The square root of 20705339 is about 4550.3119673271. The cubic root of 20705339 is about 274.5959421452.

The spelling of 20705339 in words is "twenty million, seven hundred five thousand, three hundred thirty-nine".