20338703873721 has 24 divisors (see below), whose sum is σ = 31262565859200. Its totient is φ = 12697411326336.

The previous prime is 20338703873717. The next prime is 20338703873737. The reversal of 20338703873721 is 12737830783302.

It is a happy number.

20338703873721 is a `hidden beast` number, since 203 + 3 + 8 + 7 + 0 + 387 + 37 + 21 = 666.

It is not a de Polignac number, because 20338703873721 - 2² = 20338703873717 is a prime.

It is a super-2 number, since 2×20338703873721² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20338703873711) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 333971325 + ... + 334032218.

It is an arithmetic number, because the mean of its divisors is an integer number (1302606910800).

Almost surely, 2^{20338703873721} is an apocalyptic number.

It is an amenable number.

20338703873721 is a deficient number, since it is larger than the sum of its proper divisors (10923861985479).

20338703873721 is a wasteful number, since it uses less digits than its factorization.

20338703873721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 668003765 (or 668003762 counting only the distinct ones).

The product of its (nonzero) digits is 7112448, while the sum is 54.

The spelling of 20338703873721 in words is "twenty trillion, three hundred thirty-eight billion, seven hundred three million, eight hundred seventy-three thousand, seven hundred twenty-one".