20681516207 has 16 divisors (see below), whose sum is σ = 24151651200. Its totient is φ = 17509926240.

The previous prime is 20681516161. The next prime is 20681516213. The reversal of 20681516207 is 70261518602.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20681516207 is a prime.

It is a super-2 number, since 2×20681516207² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20681506207) 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 15 ways as a sum of consecutive naturals, for example, 826268 + ... + 850929.

It is an arithmetic number, because the mean of its divisors is an integer number (1509478200).

Almost surely, 2^20681516207 is an apocalyptic number.

20681516207 is a deficient number, since it is larger than the sum of its proper divisors (3470134993).

20681516207 is a wasteful number, since it uses less digits than its factorization.

20681516207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1677286.

The product of its (nonzero) digits is 40320, while the sum is 38.

The spelling of 20681516207 in words is "twenty billion, six hundred eighty-one million, five hundred sixteen thousand, two hundred seven".