20747747707423 has 4 divisors (see below), whose sum is σ = 22633906589928. Its totient is φ = 18861588824920.

The previous prime is 20747747707411. The next prime is 20747747707471. The reversal of 20747747707423 is 32470774774702.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20747747707423 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 (20747747707223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 943079441236 + ... + 943079441257.

It is an arithmetic number, because the mean of its divisors is an integer number (5658476647482).

Almost surely, 2^{20747747707423} is an apocalyptic number.

20747747707423 is a deficient number, since it is larger than the sum of its proper divisors (1886158882505).

20747747707423 is a wasteful number, since it uses less digits than its factorization.

20747747707423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1886158882504.

The product of its (nonzero) digits is 90354432, while the sum is 61.

The spelling of 20747747707423 in words is "twenty trillion, seven hundred forty-seven billion, seven hundred forty-seven million, seven hundred seven thousand, four hundred twenty-three".