20564647643347 has 12 divisors (see below), whose sum is σ = 21871842621280. Its totient is φ = 19331614901376.

The previous prime is 20564647643329. The next prime is 20564647643453. The reversal of 20564647643347 is 74334674646502.

It is not a de Polignac number, because 20564647643347 - 2⁴³ = 11768554621139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20564647643317) 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 11 ways as a sum of consecutive naturals, for example, 42678363 + ... + 43157524.

Almost surely, 2^{20564647643347} is an apocalyptic number.

20564647643347 is a deficient number, since it is larger than the sum of its proper divisors (1307194977933).

20564647643347 is an equidigital number, since it uses as much as digits as its factorization.

20564647643347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85836750 (or 85836733 counting only the distinct ones).

The product of its (nonzero) digits is 243855360, while the sum is 61.

The spelling of 20564647643347 in words is "twenty trillion, five hundred sixty-four billion, six hundred forty-seven million, six hundred forty-three thousand, three hundred forty-seven".