20081279 has 4 divisors (see below), whose sum is σ = 20129400. Its totient is φ = 20033160.

The previous prime is 20081263. The next prime is 20081291. The reversal of 20081279 is 97218002.

It is a happy number.

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 20081279 - 2⁴ = 20081263 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20081779) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23429 + ... + 24270.

It is an arithmetic number, because the mean of its divisors is an integer number (5032350).

Almost surely, 2^20081279 is an apocalyptic number.

20081279 is a deficient number, since it is larger than the sum of its proper divisors (48121).

20081279 is an equidigital number, since it uses as much as digits as its factorization.

20081279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48120.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 20081279 is about 4481.2140096184. The cubic root of 20081279 is about 271.8089732471.

The spelling of 20081279 in words is "twenty million, eighty-one thousand, two hundred seventy-nine".