20806878 has 16 divisors (see below), whose sum is σ = 44061840. Its totient is φ = 6527616.

The previous prime is 20806871. The next prime is 20806897. The reversal of 20806878 is 87860802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20806871) 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 7 ways as a sum of consecutive naturals, for example, 101893 + ... + 102096.

It is an arithmetic number, because the mean of its divisors is an integer number (2753865).

Almost surely, 2^20806878 is an apocalyptic number.

20806878 is an abundant number, since it is smaller than the sum of its proper divisors (23254962).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20806878 is a wasteful number, since it uses less digits than its factorization.

20806878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204011.

The product of its (nonzero) digits is 43008, while the sum is 39.

The square root of 20806878 is about 4561.4556887029. The cubic root of 20806878 is about 275.0440832911.

The spelling of 20806878 in words is "twenty million, eight hundred six thousand, eight hundred seventy-eight".