20320056247 has 8 divisors (see below), whose sum is σ = 20672755200. Its totient is φ = 19967633784.

The previous prime is 20320056241. The next prime is 20320056269. The reversal of 20320056247 is 74265002302.

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-20320056247 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 (20320056241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81978 + ... + 217624.

It is an arithmetic number, because the mean of its divisors is an integer number (2584094400).

Almost surely, 2^20320056247 is an apocalyptic number.

20320056247 is a deficient number, since it is larger than the sum of its proper divisors (352698953).

20320056247 is a wasteful number, since it uses less digits than its factorization.

20320056247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138245.

The product of its (nonzero) digits is 20160, while the sum is 31.

Adding to 20320056247 its reverse (74265002302), we get a palindrome (94585058549).

The spelling of 20320056247 in words is "twenty billion, three hundred twenty million, fifty-six thousand, two hundred forty-seven".