20207879 has 4 divisors (see below), whose sum is σ = 20404176. Its totient is φ = 20011584.

The previous prime is 20207861. The next prime is 20207909. The reversal of 20207879 is 97870202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97870202 = 2 ⋅48935101.

It is a cyclic number.

It is not a de Polignac number, because 20207879 - 2⁸ = 20207623 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 (20207819) 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, 97994 + ... + 98199.

It is an arithmetic number, because the mean of its divisors is an integer number (5101044).

Almost surely, 2^20207879 is an apocalyptic number.

20207879 is a deficient number, since it is larger than the sum of its proper divisors (196297).

20207879 is a wasteful number, since it uses less digits than its factorization.

20207879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196296.

The product of its (nonzero) digits is 14112, while the sum is 35.

The square root of 20207879 is about 4495.3174526389. The cubic root of 20207879 is about 272.3789727121.

The spelling of 20207879 in words is "twenty million, two hundred seven thousand, eight hundred seventy-nine".