20979039 has 8 divisors (see below), whose sum is σ = 28013440. Its totient is φ = 13965336.

The previous prime is 20979029. The next prime is 20979047. The reversal of 20979039 is 93097902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-20979039 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20978988 and 20979006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20979019) 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, 2629 + ... + 6990.

It is an arithmetic number, because the mean of its divisors is an integer number (3501680).

Almost surely, 2^20979039 is an apocalyptic number.

20979039 is a deficient number, since it is larger than the sum of its proper divisors (7034401).

20979039 is an equidigital number, since it uses as much as digits as its factorization.

20979039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10349.

The product of its (nonzero) digits is 30618, while the sum is 39.

The square root of 20979039 is about 4580.2880913759. The cubic root of 20979039 is about 275.8005937315.

The spelling of 20979039 in words is "twenty million, nine hundred seventy-nine thousand, thirty-nine".