20318979 has 8 divisors (see below), whose sum is σ = 27345600. Its totient is φ = 13419176.

The previous prime is 20318971. The next prime is 20318989. The reversal of 20318979 is 97981302.

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 20318979 - 2³ = 20318971 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20318971) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31329 + ... + 31970.

It is an arithmetic number, because the mean of its divisors is an integer number (3418200).

Almost surely, 2^20318979 is an apocalyptic number.

20318979 is a deficient number, since it is larger than the sum of its proper divisors (7026621).

20318979 is a wasteful number, since it uses less digits than its factorization.

20318979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63409.

The product of its (nonzero) digits is 27216, while the sum is 39.

The square root of 20318979 is about 4507.6578175367. The cubic root of 20318979 is about 272.8772274640.

The spelling of 20318979 in words is "twenty million, three hundred eighteen thousand, nine hundred seventy-nine".