20979411 has 8 divisors (see below), whose sum is σ = 29618064. Its totient is φ = 13163520.

The previous prime is 20979403. The next prime is 20979421. The reversal of 20979411 is 11497902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20979411 - 2³ = 20979403 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20979421) 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, 205630 + ... + 205731.

It is an arithmetic number, because the mean of its divisors is an integer number (3702258).

Almost surely, 2^20979411 is an apocalyptic number.

20979411 is a deficient number, since it is larger than the sum of its proper divisors (8638653).

20979411 is a wasteful number, since it uses less digits than its factorization.

20979411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 411381.

The product of its (nonzero) digits is 4536, while the sum is 33.

The square root of 20979411 is about 4580.3286999952. The cubic root of 20979411 is about 275.8022238859.

The spelling of 20979411 in words is "twenty million, nine hundred seventy-nine thousand, four hundred eleven".