20960809 has 8 divisors (see below), whose sum is σ = 21369920. Its totient is φ = 20555856.

The previous prime is 20960803. The next prime is 20960831. The reversal of 20960809 is 90806902.

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 20960809 - 2⁵ = 20960777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20960803) 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, 10294 + ... + 12160.

It is an arithmetic number, because the mean of its divisors is an integer number (2671240).

Almost surely, 2^20960809 is an apocalyptic number.

It is an amenable number.

20960809 is a deficient number, since it is larger than the sum of its proper divisors (409111).

20960809 is a wasteful number, since it uses less digits than its factorization.

20960809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2079.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 20960809 is about 4578.2976093740. The cubic root of 20960809 is about 275.7206837817.

The spelling of 20960809 in words is "twenty million, nine hundred sixty thousand, eight hundred nine".