20013721236726 has 64 divisors (see below), whose sum is σ = 46498172497920. Its totient is φ = 5624151039360.

The previous prime is 20013721236689. The next prime is 20013721236727. The reversal of 20013721236726 is 62763212731002.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20013721236727) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 47749420 + ... + 48166736.

It is an arithmetic number, because the mean of its divisors is an integer number (726533945280).

Almost surely, 2^{20013721236726} is an apocalyptic number.

20013721236726 is an abundant number, since it is smaller than the sum of its proper divisors (26484451261194).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20013721236726 is a wasteful number, since it uses less digits than its factorization.

20013721236726 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 436109.

The product of its (nonzero) digits is 254016, while the sum is 42.

Adding to 20013721236726 its reverse (62763212731002), we get a palindrome (82776933967728).

The spelling of 20013721236726 in words is "twenty trillion, thirteen billion, seven hundred twenty-one million, two hundred thirty-six thousand, seven hundred twenty-six".