20879609 has 8 divisors (see below), whose sum is σ = 21627648. Its totient is φ = 20144320.

The previous prime is 20879603. The next prime is 20879611. The reversal of 20879609 is 90697802.

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 20879609 - 2²⁴ = 4102393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20879603) 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, 209 + ... + 6465.

It is an arithmetic number, because the mean of its divisors is an integer number (2703456).

Almost surely, 2^20879609 is an apocalyptic number.

It is an amenable number.

20879609 is a deficient number, since it is larger than the sum of its proper divisors (748039).

20879609 is an equidigital number, since it uses as much as digits as its factorization.

20879609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6375.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 20879609 is about 4569.4210793053. The cubic root of 20879609 is about 275.3641852615.

The spelling of 20879609 in words is "twenty million, eight hundred seventy-nine thousand, six hundred nine".