20013721567423 has 8 divisors (see below), whose sum is σ = 20020265582576. Its totient is φ = 20007178632000.

The previous prime is 20013721567409. The next prime is 20013721567517. The reversal of 20013721567423 is 32476512731002.

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

It is a cyclic number.

It is not a de Polignac number, because 20013721567423 - 2²¹ = 20013719470271 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20013721567423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20013721567223) 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, 37674565 + ... + 38202097.

It is an arithmetic number, because the mean of its divisors is an integer number (2502533197822).

Almost surely, 2^{20013721567423} is an apocalyptic number.

20013721567423 is a deficient number, since it is larger than the sum of its proper divisors (6544015153).

20013721567423 is an equidigital number, since it uses as much as digits as its factorization.

20013721567423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 539865.

The product of its (nonzero) digits is 423360, while the sum is 43.

The spelling of 20013721567423 in words is "twenty trillion, thirteen billion, seven hundred twenty-one million, five hundred sixty-seven thousand, four hundred twenty-three".