20875879 has 4 divisors (see below), whose sum is σ = 21040384. Its totient is φ = 20711376.

The previous prime is 20875871. The next prime is 20875891. The reversal of 20875879 is 97857802.

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 20875879 - 2³ = 20875871 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 (20875871) 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, 82062 + ... + 82315.

It is an arithmetic number, because the mean of its divisors is an integer number (5260096).

Almost surely, 2^20875879 is an apocalyptic number.

20875879 is a deficient number, since it is larger than the sum of its proper divisors (164505).

20875879 is a wasteful number, since it uses less digits than its factorization.

20875879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164504.

The product of its (nonzero) digits is 282240, while the sum is 46.

The square root of 20875879 is about 4569.0129130918. The cubic root of 20875879 is about 275.3477869726.

The spelling of 20875879 in words is "twenty million, eight hundred seventy-five thousand, eight hundred seventy-nine".