20969785692 has 36 divisors (see below), whose sum is σ = 53798113096. Its totient is φ = 6885600480.

The previous prime is 20969785687. The next prime is 20969785709. The reversal of 20969785692 is 29658796902.

20969785692 is a `hidden beast` number, since 2 + 0 + 9 + 69 + 7 + 8 + 569 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Smith number, since the sum of its digits (63) coincides with the sum of the digits of its prime factors.

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 4344559 + ... + 4349382.

Almost surely, 2^20969785692 is an apocalyptic number.

It is an amenable number.

20969785692 is an abundant number, since it is smaller than the sum of its proper divisors (32828327404).

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

20969785692 is a wasteful number, since it uses less digits than its factorization.

20969785692 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8694018 (or 8694013 counting only the distinct ones).

The product of its (nonzero) digits is 29393280, while the sum is 63.

The spelling of 20969785692 in words is "twenty billion, nine hundred sixty-nine million, seven hundred eighty-five thousand, six hundred ninety-two".