20775729966 has 16 divisors (see below), whose sum is σ = 41563404288. Its totient is φ = 6923252600.

The previous prime is 20775729941. The next prime is 20775730037. The reversal of 20775729966 is 66992757702.

It is a super-2 number, since 2×20775729966² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

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, 474990 + ... + 516881.

It is an arithmetic number, because the mean of its divisors is an integer number (2597712768).

Almost surely, 2^20775729966 is an apocalyptic number.

20775729966 is an abundant number, since it is smaller than the sum of its proper divisors (20787674322).

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

20775729966 is a wasteful number, since it uses less digits than its factorization.

20775729966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 995367.

The product of its (nonzero) digits is 20003760, while the sum is 60.

The spelling of 20775729966 in words is "twenty billion, seven hundred seventy-five million, seven hundred twenty-nine thousand, nine hundred sixty-six".