20680534993 has 4 divisors (see below), whose sum is σ = 20681811568. Its totient is φ = 20679258420.

The previous prime is 20680534951. The next prime is 20680534997. The reversal of 20680534993 is 39943508602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20680534993 - 2²¹ = 20678437841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20680534997) 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 3 ways as a sum of consecutive naturals, for example, 613671 + ... + 646492.

It is an arithmetic number, because the mean of its divisors is an integer number (5170452892).

Almost surely, 2^20680534993 is an apocalyptic number.

It is an amenable number.

20680534993 is a deficient number, since it is larger than the sum of its proper divisors (1276575).

20680534993 is a wasteful number, since it uses less digits than its factorization.

20680534993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1276574.

The product of its (nonzero) digits is 1399680, while the sum is 49.

The spelling of 20680534993 in words is "twenty billion, six hundred eighty million, five hundred thirty-four thousand, nine hundred ninety-three".