20879617 has 8 divisors (see below), whose sum is σ = 22905792. Its totient is φ = 18874800.

The previous prime is 20879611. The next prime is 20879627. The reversal of 20879617 is 71697802.

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 20879617 - 2²³ = 12491009 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 20879617.

It is not an unprimeable number, because it can be changed into a prime (20879611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3253 + ... + 7234.

It is an arithmetic number, because the mean of its divisors is an integer number (2863224).

Almost surely, 2^20879617 is an apocalyptic number.

It is an amenable number.

20879617 is a deficient number, since it is larger than the sum of its proper divisors (2026175).

20879617 is a wasteful number, since it uses less digits than its factorization.

20879617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10679.

The product of its (nonzero) digits is 42336, while the sum is 40.

The square root of 20879617 is about 4569.4219546897. The cubic root of 20879617 is about 275.3642204300.

The spelling of 20879617 in words is "twenty million, eight hundred seventy-nine thousand, six hundred seventeen".