20117700124637 has 4 divisors (see below), whose sum is σ = 20117726241180. Its totient is φ = 20117674008096.

The previous prime is 20117700124589. The next prime is 20117700124663. The reversal of 20117700124637 is 73642100771102.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 9357272989156 + 10760427135481 = 3058966^2 + 3280309^2 .

It is a cyclic number.

It is not a de Polignac number, because 20117700124637 - 2⁶ = 20117700124573 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20117700124594 and 20117700124603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20117700124037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11866562 + ... + 13455507.

It is an arithmetic number, because the mean of its divisors is an integer number (5029431560295).

Almost surely, 2^{20117700124637} is an apocalyptic number.

It is an amenable number.

20117700124637 is a deficient number, since it is larger than the sum of its proper divisors (26116543).

20117700124637 is an equidigital number, since it uses as much as digits as its factorization.

20117700124637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26116542.

The product of its (nonzero) digits is 98784, while the sum is 41.

Adding to 20117700124637 its reverse (73642100771102), we get a palindrome (93759800895739).

The spelling of 20117700124637 in words is "twenty trillion, one hundred seventeen billion, seven hundred million, one hundred twenty-four thousand, six hundred thirty-seven".