20908066779 has 12 divisors (see below), whose sum is σ = 30201990000. Its totient is φ = 13938042384.

The previous prime is 20908066771. The next prime is 20908066801. The reversal of 20908066779 is 97766080902.

It is not a de Polignac number, because 20908066779 - 2³ = 20908066771 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20908066771) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 207882 + ... + 291600.

It is an arithmetic number, because the mean of its divisors is an integer number (2516832500).

Almost surely, 2^20908066779 is an apocalyptic number.

20908066779 is a deficient number, since it is larger than the sum of its proper divisors (9293923221).

20908066779 is a wasteful number, since it uses less digits than its factorization.

20908066779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111474 (or 111471 counting only the distinct ones).

The product of its (nonzero) digits is 2286144, while the sum is 54.

The spelling of 20908066779 in words is "twenty billion, nine hundred eight million, sixty-six thousand, seven hundred seventy-nine".