20079979 has 8 divisors (see below), whose sum is σ = 21217680. Its totient is φ = 18950400.

The previous prime is 20079973. The next prime is 20079991. The reversal of 20079979 is 97997002.

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 20079979 - 2⁹ = 20079467 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20079973) 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, 3459 + ... + 7219.

It is an arithmetic number, because the mean of its divisors is an integer number (2652210).

Almost surely, 2^20079979 is an apocalyptic number.

20079979 is a deficient number, since it is larger than the sum of its proper divisors (1137701).

20079979 is a wasteful number, since it uses less digits than its factorization.

20079979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4061.

The product of its (nonzero) digits is 71442, while the sum is 43.

The square root of 20079979 is about 4481.0689572913. The cubic root of 20079979 is about 271.8031077626.

The spelling of 20079979 in words is "twenty million, seventy-nine thousand, nine hundred seventy-nine".