20665332893 has 8 divisors (see below), whose sum is σ = 20881579320. Its totient is φ = 20449152000.

The previous prime is 20665332817. The next prime is 20665332929. The reversal of 20665332893 is 39823356602.

It can be written as a sum of positive squares in 4 ways, for example, as 261210244 + 20404122649 = 16162^2 + 142843^2 .

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

It is not a de Polignac number, because 20665332893 - 2¹² = 20665328797 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 (20665335893) 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, 861263 + ... + 884931.

It is an arithmetic number, because the mean of its divisors is an integer number (2610197415).

Almost surely, 2^20665332893 is an apocalyptic number.

It is an amenable number.

20665332893 is a deficient number, since it is larger than the sum of its proper divisors (216246427).

20665332893 is an equidigital number, since it uses as much as digits as its factorization.

20665332893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32767.

The product of its (nonzero) digits is 1399680, while the sum is 47.

The spelling of 20665332893 in words is "twenty billion, six hundred sixty-five million, three hundred thirty-two thousand, eight hundred ninety-three".