20969869868 has 12 divisors (see below), whose sum is σ = 37478065632. Its totient is φ = 10261851120.

The previous prime is 20969869849. The next prime is 20969869873. The reversal of 20969869868 is 86896896902.

It is an unprimeable number.

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, 55770743 + ... + 55771118.

It is an arithmetic number, because the mean of its divisors is an integer number (3123172136).

Almost surely, 2^20969869868 is an apocalyptic number.

It is an amenable number.

20969869868 is a deficient number, since it is larger than the sum of its proper divisors (16508195764).

20969869868 is a wasteful number, since it uses less digits than its factorization.

20969869868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111541912 (or 111541910 counting only the distinct ones).

The product of its (nonzero) digits is 161243136, while the sum is 71.

The spelling of 20969869868 in words is "twenty billion, nine hundred sixty-nine million, eight hundred sixty-nine thousand, eight hundred sixty-eight".