20908079 has 8 divisors (see below), whose sum is σ = 22178448. Its totient is φ = 19642240.

The previous prime is 20908021. The next prime is 20908099. The reversal of 20908079 is 97080902.

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 20908079 - 2⁸ = 20907823 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20908099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15344 + ... + 16650.

It is an arithmetic number, because the mean of its divisors is an integer number (2772306).

Almost surely, 2^20908079 is an apocalyptic number.

20908079 is a deficient number, since it is larger than the sum of its proper divisors (1270369).

20908079 is a wasteful number, since it uses less digits than its factorization.

20908079 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2265.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 20908079 is about 4572.5352923734. The cubic root of 20908079 is about 275.4892843133.

The spelling of 20908079 in words is "twenty million, nine hundred eight thousand, seventy-nine".