20013721234706 has 4 divisors (see below), whose sum is σ = 30020581852062. Its totient is φ = 10006860617352.

The previous prime is 20013721234697. The next prime is 20013721234729. The reversal of 20013721234706 is 60743212731002.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 16041907405225 + 3971813829481 = 4005235^2 + 1992941^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20013721234706.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5003430308675 + ... + 5003430308678.

Almost surely, 2^{20013721234706} is an apocalyptic number.

20013721234706 is a deficient number, since it is larger than the sum of its proper divisors (10006860617356).

20013721234706 is a wasteful number, since it uses less digits than its factorization.

20013721234706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10006860617355.

The product of its (nonzero) digits is 84672, while the sum is 38.

Adding to 20013721234706 its reverse (60743212731002), we get a palindrome (80756933965708).

The spelling of 20013721234706 in words is "twenty trillion, thirteen billion, seven hundred twenty-one million, two hundred thirty-four thousand, seven hundred six".