20880859 has 4 divisors (see below), whose sum is σ = 20895040. Its totient is φ = 20866680.

The previous prime is 20880833. The next prime is 20880877. The reversal of 20880859 is 95808802.

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 20880859 - 2⁷ = 20880731 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20880809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4587 + ... + 7924.

It is an arithmetic number, because the mean of its divisors is an integer number (5223760).

Almost surely, 2^20880859 is an apocalyptic number.

20880859 is a deficient number, since it is larger than the sum of its proper divisors (14181).

20880859 is a wasteful number, since it uses less digits than its factorization.

20880859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14180.

The product of its (nonzero) digits is 46080, while the sum is 40.

The square root of 20880859 is about 4569.5578560732. The cubic root of 20880859 is about 275.3696802297.

The spelling of 20880859 in words is "twenty million, eight hundred eighty thousand, eight hundred fifty-nine".