20316979 has 4 divisors (see below), whose sum is σ = 20413480. Its totient is φ = 20220480.

The previous prime is 20316977. The next prime is 20316991. The reversal of 20316979 is 97961302.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20316979 - 2¹ = 20316977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20316973) 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 3 ways as a sum of consecutive naturals, for example, 47934 + ... + 48355.

It is an arithmetic number, because the mean of its divisors is an integer number (5103370).

Almost surely, 2^20316979 is an apocalyptic number.

20316979 is a deficient number, since it is larger than the sum of its proper divisors (96501).

20316979 is an equidigital number, since it uses as much as digits as its factorization.

20316979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96500.

The product of its (nonzero) digits is 20412, while the sum is 37.

The square root of 20316979 is about 4507.4359673766. The cubic root of 20316979 is about 272.8682740554.

The spelling of 20316979 in words is "twenty million, three hundred sixteen thousand, nine hundred seventy-nine".