20644755427423 has 8 divisors (see below), whose sum is σ = 21366609379200. Its totient is φ = 19923565864608.

The previous prime is 20644755427409. The next prime is 20644755427477. The reversal of 20644755427423 is 32472455744602.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20644755427423 is a prime.

It is a super-2 number, since 2×20644755427423² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20644755427493) 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, 166034008 + ... + 166158301.

It is an arithmetic number, because the mean of its divisors is an integer number (2670826172400).

Almost surely, 2^{20644755427423} is an apocalyptic number.

20644755427423 is a deficient number, since it is larger than the sum of its proper divisors (721853951777).

20644755427423 is a wasteful number, since it uses less digits than its factorization.

20644755427423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332194481.

The product of its (nonzero) digits is 45158400, while the sum is 55.

The spelling of 20644755427423 in words is "twenty trillion, six hundred forty-four billion, seven hundred fifty-five million, four hundred twenty-seven thousand, four hundred twenty-three".