20767921776 has 100 divisors (see below), whose sum is σ = 68695333872. Its totient is φ = 5933689344.

The previous prime is 20767921651. The next prime is 20767921777. The reversal of 20767921776 is 67712976702.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20767921777) by changing a digit.

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 19 ways as a sum of consecutive naturals, for example, 1135545 + ... + 1153688.

Almost surely, 2^20767921776 is an apocalyptic number.

It is an amenable number.

20767921776 is an abundant number, since it is smaller than the sum of its proper divisors (47927412096).

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

20767921776 is a wasteful number, since it uses less digits than its factorization.

20767921776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2289260 (or 2289245 counting only the distinct ones).

The product of its (nonzero) digits is 3111696, while the sum is 54.

The spelling of 20767921776 in words is "twenty billion, seven hundred sixty-seven million, nine hundred twenty-one thousand, seven hundred seventy-six".