20864753643 has 8 divisors (see below), whose sum is σ = 27823176256. Its totient is φ = 13908083400.

The previous prime is 20864753617. The next prime is 20864753653. The reversal of 20864753643 is 34635746802.

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

It is not a de Polignac number, because 20864753643 - 2¹⁰ = 20864752619 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20864753592 and 20864753601.

It is not an unprimeable number, because it can be changed into a prime (20864753603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 410053 + ... + 458118.

It is an arithmetic number, because the mean of its divisors is an integer number (3477897032).

Almost surely, 2^20864753643 is an apocalyptic number.

20864753643 is a deficient number, since it is larger than the sum of its proper divisors (6958422613).

20864753643 is an equidigital number, since it uses as much as digits as its factorization.

20864753643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 876185.

The product of its (nonzero) digits is 2903040, while the sum is 48.

The spelling of 20864753643 in words is "twenty billion, eight hundred sixty-four million, seven hundred fifty-three thousand, six hundred forty-three".