20847757443 has 4 divisors (see below), whose sum is σ = 27797009928. Its totient is φ = 13898504960.

The previous prime is 20847757417. The next prime is 20847757547. The reversal of 20847757443 is 34475774802.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20847757443 - 2⁶ = 20847757379 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20847758443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3474626238 + ... + 3474626243.

It is an arithmetic number, because the mean of its divisors is an integer number (6949252482).

Almost surely, 2^20847757443 is an apocalyptic number.

20847757443 is a deficient number, since it is larger than the sum of its proper divisors (6949252485).

20847757443 is an equidigital number, since it uses as much as digits as its factorization.

20847757443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6949252484.

The product of its (nonzero) digits is 5268480, while the sum is 51.

The spelling of 20847757443 in words is "twenty billion, eight hundred forty-seven million, seven hundred fifty-seven thousand, four hundred forty-three".