20013721234747 has 8 divisors (see below), whose sum is σ = 21191044941936. Its totient is φ = 18836402637312.

The previous prime is 20013721234729. The next prime is 20013721234753. The reversal of 20013721234747 is 74743212731002.

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 20013721234747 - 2³⁵ = 19979361496379 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20013721234447) 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, 9279043 + ... + 11230675.

It is an arithmetic number, because the mean of its divisors is an integer number (2648880617742).

Almost surely, 2^{20013721234747} is an apocalyptic number.

20013721234747 is a deficient number, since it is larger than the sum of its proper divisors (1177323707189).

20013721234747 is a wasteful number, since it uses less digits than its factorization.

20013721234747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2554877.

The product of its (nonzero) digits is 395136, while the sum is 43.

Adding to 20013721234747 its reverse (74743212731002), we get a palindrome (94756933965749).

The spelling of 20013721234747 in words is "twenty trillion, thirteen billion, seven hundred twenty-one million, two hundred thirty-four thousand, seven hundred forty-seven".