20681137285388 has 12 divisors (see below), whose sum is σ = 36192095205672. Its totient is φ = 10340538655200.

The previous prime is 20681137285381. The next prime is 20681137285429. The reversal of 20681137285388 is 88358273118602.

It is a self number, because there is not a number n which added to its sum of digits gives 20681137285388.

It is not an unprimeable number, because it can be changed into a prime (20681137285381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5907713 + ... + 8732888.

It is an arithmetic number, because the mean of its divisors is an integer number (3016007933806).

Almost surely, 2^{20681137285388} is an apocalyptic number.

It is an amenable number.

20681137285388 is a deficient number, since it is larger than the sum of its proper divisors (15510957920284).

20681137285388 is a wasteful number, since it uses less digits than its factorization.

20681137285388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14993752 (or 14993750 counting only the distinct ones).

The product of its (nonzero) digits is 30965760, while the sum is 62.

The spelling of 20681137285388 in words is "twenty trillion, six hundred eighty-one billion, one hundred thirty-seven million, two hundred eighty-five thousand, three hundred eighty-eight".