20366722721 has 24 divisors (see below), whose sum is σ = 21891447936. Its totient is φ = 18942624000.

The previous prime is 20366722693. The next prime is 20366722741. The reversal of 20366722721 is 12722766302.

It is a de Polignac number, because none of the positive numbers 2^k-20366722721 is a prime.

It is a super-3 number, since 3×20366722721³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20366722741) 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 23 ways as a sum of consecutive naturals, for example, 23222735 + ... + 23223611.

It is an arithmetic number, because the mean of its divisors is an integer number (912143664).

Almost surely, 2^20366722721 is an apocalyptic number.

It is an amenable number.

20366722721 is a deficient number, since it is larger than the sum of its proper divisors (1524725215).

20366722721 is a wasteful number, since it uses less digits than its factorization.

20366722721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1769 (or 1752 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 38.

The spelling of 20366722721 in words is "twenty billion, three hundred sixty-six million, seven hundred twenty-two thousand, seven hundred twenty-one".