20117630722751 has 4 divisors (see below), whose sum is σ = 20117639748072. Its totient is φ = 20117621697432.

The previous prime is 20117630722727. The next prime is 20117630722753. The reversal of 20117630722751 is 15722703671102.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20117630722751 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20117630722753) 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, 1511645 + ... + 6520761.

It is an arithmetic number, because the mean of its divisors is an integer number (5029409937018).

Almost surely, 2^{20117630722751} is an apocalyptic number.

20117630722751 is a deficient number, since it is larger than the sum of its proper divisors (9025321).

20117630722751 is an equidigital number, since it uses as much as digits as its factorization.

20117630722751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9025320.

The product of its (nonzero) digits is 246960, while the sum is 44.

The spelling of 20117630722751 in words is "twenty trillion, one hundred seventeen billion, six hundred thirty million, seven hundred twenty-two thousand, seven hundred fifty-one".