20969678815 has 16 divisors (see below), whose sum is σ = 25680643200. Its totient is φ = 16433069472.

The previous prime is 20969678783. The next prime is 20969678869. The reversal of 20969678815 is 51887696902.

It is a cyclic number.

It is not a de Polignac number, because 20969678815 - 2⁵ = 20969678783 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42105 + ... + 209074.

It is an arithmetic number, because the mean of its divisors is an integer number (1605040200).

Almost surely, 2^20969678815 is an apocalyptic number.

20969678815 is a deficient number, since it is larger than the sum of its proper divisors (4710964385).

20969678815 is a wasteful number, since it uses less digits than its factorization.

20969678815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251526.

The product of its (nonzero) digits is 13063680, while the sum is 61.

The spelling of 20969678815 in words is "twenty billion, nine hundred sixty-nine million, six hundred seventy-eight thousand, eight hundred fifteen".