20013172623646 has 8 divisors (see below), whose sum is σ = 30988138256064. Its totient is φ = 9683793204960.

The previous prime is 20013172623643. The next prime is 20013172623671. The reversal of 20013172623646 is 64632627131002.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20013172623643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 161396553355 + ... + 161396553478.

It is an arithmetic number, because the mean of its divisors is an integer number (3873517282008).

Almost surely, 2^{20013172623646} is an apocalyptic number.

20013172623646 is a deficient number, since it is larger than the sum of its proper divisors (10974965632418).

20013172623646 is a wasteful number, since it uses less digits than its factorization.

20013172623646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322793106866.

The product of its (nonzero) digits is 435456, while the sum is 43.

Adding to 20013172623646 its reverse (64632627131002), we get a palindrome (84645799754648).

The spelling of 20013172623646 in words is "twenty trillion, thirteen billion, one hundred seventy-two million, six hundred twenty-three thousand, six hundred forty-six".