20896739 has 4 divisors (see below), whose sum is σ = 21035280. Its totient is φ = 20758200.

The previous prime is 20896721. The next prime is 20896741. The reversal of 20896739 is 93769802.

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 20896739 - 2⁸ = 20896483 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20896739.

It is not an unprimeable number, because it can be changed into a prime (20896039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69044 + ... + 69345.

It is an arithmetic number, because the mean of its divisors is an integer number (5258820).

Almost surely, 2^20896739 is an apocalyptic number.

20896739 is a deficient number, since it is larger than the sum of its proper divisors (138541).

20896739 is a wasteful number, since it uses less digits than its factorization.

20896739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138540.

The product of its (nonzero) digits is 163296, while the sum is 44.

The square root of 20896739 is about 4571.2951118912. The cubic root of 20896739 is about 275.4394692242.

The spelling of 20896739 in words is "twenty million, eight hundred ninety-six thousand, seven hundred thirty-nine".