20735443655 has 4 divisors (see below), whose sum is σ = 24882532392. Its totient is φ = 16588354920.

The previous prime is 20735443637. The next prime is 20735443697. The reversal of 20735443655 is 55634453702.

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

It is not a de Polignac number, because 20735443655 - 2¹⁶ = 20735378119 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2073544361 + ... + 2073544370.

It is an arithmetic number, because the mean of its divisors is an integer number (6220633098).

Almost surely, 2^20735443655 is an apocalyptic number.

20735443655 is a deficient number, since it is larger than the sum of its proper divisors (4147088737).

20735443655 is an equidigital number, since it uses as much as digits as its factorization.

20735443655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4147088736.

The product of its (nonzero) digits is 1512000, while the sum is 44.

The spelling of 20735443655 in words is "twenty billion, seven hundred thirty-five million, four hundred forty-three thousand, six hundred fifty-five".