20013721234745 has 48 divisors (see below), whose sum is σ = 29587303859328. Its totient is φ = 12931086389760.

The previous prime is 20013721234729. The next prime is 20013721234753. The reversal of 20013721234745 is 54743212731002.

It is not a de Polignac number, because 20013721234745 - 2⁴ = 20013721234729 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 26127536 + ... + 26882625.

It is an arithmetic number, because the mean of its divisors is an integer number (616402163736).

Almost surely, 2^{20013721234745} is an apocalyptic number.

It is an amenable number.

20013721234745 is a deficient number, since it is larger than the sum of its proper divisors (9573582624583).

20013721234745 is a wasteful number, since it uses less digits than its factorization.

20013721234745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53010270 (or 53010263 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 41.

Adding to 20013721234745 its reverse (54743212731002), we get a palindrome (74756933965747).

The spelling of 20013721234745 in words is "twenty trillion, thirteen billion, seven hundred twenty-one million, two hundred thirty-four thousand, seven hundred forty-five".