20566990876 has 24 divisors (see below), whose sum is σ = 38240657280. Its totient is φ = 9651205872.

The previous prime is 20566990853. The next prime is 20566990891. The reversal of 20566990876 is 67809966502.

It is a super-2 number, since 2×20566990876² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20566990876.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1256440 + ... + 1272703.

It is an arithmetic number, because the mean of its divisors is an integer number (1593360720).

Almost surely, 2^20566990876 is an apocalyptic number.

It is an amenable number.

20566990876 is a deficient number, since it is larger than the sum of its proper divisors (17673666404).

20566990876 is a wasteful number, since it uses less digits than its factorization.

20566990876 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2529273 (or 2529271 counting only the distinct ones).

The product of its (nonzero) digits is 9797760, while the sum is 58.

The spelling of 20566990876 in words is "twenty billion, five hundred sixty-six million, nine hundred ninety thousand, eight hundred seventy-six".