20979706 has 12 divisors (see below), whose sum is σ = 34590906. Its totient is φ = 9536120.

The previous prime is 20979697. The next prime is 20979727. The reversal of 20979706 is 60797902.

It can be written as a sum of positive squares in only one way, i.e., 17015625 + 3964081 = 4125^2 + 1991^2 .

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 43105 + ... + 43588.

Almost surely, 2^20979706 is an apocalyptic number.

20979706 is a deficient number, since it is larger than the sum of its proper divisors (13611200).

20979706 is a wasteful number, since it uses less digits than its factorization.

20979706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86717 (or 86706 counting only the distinct ones).

The product of its (nonzero) digits is 47628, while the sum is 40.

The square root of 20979706 is about 4580.3609028110. The cubic root of 20979706 is about 275.8035166021.

The spelling of 20979706 in words is "twenty million, nine hundred seventy-nine thousand, seven hundred six".