11720520247 has 8 divisors (see below), whose sum is σ = 11829149696. Its totient is φ = 11612146392.

The previous prime is 11720520211. The next prime is 11720520257. The reversal of 11720520247 is 74202502711.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11720520247 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 (11720520257) 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 7 ways as a sum of consecutive naturals, for example, 28858 + ... + 155800.

It is an arithmetic number, because the mean of its divisors is an integer number (1478643712).

Almost surely, 2^11720520247 is an apocalyptic number.

11720520247 is a deficient number, since it is larger than the sum of its proper divisors (108629449).

11720520247 is a wasteful number, since it uses less digits than its factorization.

11720520247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127797.

The product of its (nonzero) digits is 7840, while the sum is 31.

The spelling of 11720520247 in words is "eleven billion, seven hundred twenty million, five hundred twenty thousand, two hundred forty-seven".