20611806878 has 16 divisors (see below), whose sum is σ = 34070323056. Its totient is φ = 9291905280.

The previous prime is 20611806851. The next prime is 20611806883. The reversal of 20611806878 is 87860811602.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9217043 + ... + 9219278.

It is an arithmetic number, because the mean of its divisors is an integer number (2129395191).

Almost surely, 2^20611806878 is an apocalyptic number.

20611806878 is a deficient number, since it is larger than the sum of its proper divisors (13458516178).

20611806878 is a wasteful number, since it uses less digits than its factorization.

20611806878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18436379.

The product of its (nonzero) digits is 258048, while the sum is 47.

The spelling of 20611806878 in words is "twenty billion, six hundred eleven million, eight hundred six thousand, eight hundred seventy-eight".