20563989423 has 8 divisors (see below), whose sum is σ = 27419329200. Its totient is φ = 13708987968.

The previous prime is 20563989421. The next prime is 20563989461. The reversal of 20563989423 is 32498936502.

It is a happy number.

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

It is not a de Polignac number, because 20563989423 - 2¹ = 20563989421 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20563989421) 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, 150933 + ... + 252801.

It is an arithmetic number, because the mean of its divisors is an integer number (3427416150).

Almost surely, 2^20563989423 is an apocalyptic number.

20563989423 is a deficient number, since it is larger than the sum of its proper divisors (6855339777).

20563989423 is a wasteful number, since it uses less digits than its factorization.

20563989423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169161.

The product of its (nonzero) digits is 2799360, while the sum is 51.

The spelling of 20563989423 in words is "twenty billion, five hundred sixty-three million, nine hundred eighty-nine thousand, four hundred twenty-three".