20786865808 has 40 divisors (see below), whose sum is σ = 41378522240. Its totient is φ = 10108748160.

The previous prime is 20786865761. The next prime is 20786865823. The reversal of 20786865808 is 80856868702.

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, 2208793 + ... + 2218183.

It is an arithmetic number, because the mean of its divisors is an integer number (1034463056).

Almost surely, 2^20786865808 is an apocalyptic number.

It is an amenable number.

20786865808 is a deficient number, since it is larger than the sum of its proper divisors (20591656432).

20786865808 is a wasteful number, since it uses less digits than its factorization.

20786865808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13175 (or 13169 counting only the distinct ones).

The product of its (nonzero) digits is 10321920, while the sum is 58.

The spelling of 20786865808 in words is "twenty billion, seven hundred eighty-six million, eight hundred sixty-five thousand, eight hundred eight".