20117043623677 has 128 divisors (see below), whose sum is σ = 28249598361600. Its totient is φ = 13821925017600.

The previous prime is 20117043623671. The next prime is 20117043623687. The reversal of 20117043623677 is 77632634071102.

It is a happy number.

It is not a de Polignac number, because 20117043623677 - 2¹¹ = 20117043621629 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20117043623677.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20117043623671) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 628464849 + ... + 628496857.

It is an arithmetic number, because the mean of its divisors is an integer number (220699987200).

Almost surely, 2^{20117043623677} is an apocalyptic number.

It is an amenable number.

20117043623677 is a deficient number, since it is larger than the sum of its proper divisors (8132554737923).

20117043623677 is a wasteful number, since it uses less digits than its factorization.

20117043623677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32387.

The product of its (nonzero) digits is 1778112, while the sum is 49.

Adding to 20117043623677 its reverse (77632634071102), we get a palindrome (97749677694779).

The spelling of 20117043623677 in words is "twenty trillion, one hundred seventeen billion, forty-three million, six hundred twenty-three thousand, six hundred seventy-seven".