20787716833 has 8 divisors (see below), whose sum is σ = 22393112000. Its totient is φ = 19183227408.

The previous prime is 20787716819. The next prime is 20787716843. The reversal of 20787716833 is 33861778702.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20787716833 - 2⁹ = 20787716321 is a prime.

It is a super-2 number, since 2×20787716833² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20787716843) 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, 178383 + ... + 270916.

It is an arithmetic number, because the mean of its divisors is an integer number (2799139000).

Almost surely, 2^20787716833 is an apocalyptic number.

It is an amenable number.

20787716833 is a deficient number, since it is larger than the sum of its proper divisors (1605395167).

20787716833 is a wasteful number, since it uses less digits than its factorization.

20787716833 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 452871.

The product of its (nonzero) digits is 2370816, while the sum is 52.

The spelling of 20787716833 in words is "twenty billion, seven hundred eighty-seven million, seven hundred sixteen thousand, eight hundred thirty-three".