20117557202461 has 32 divisors (see below), whose sum is σ = 21393940838400. Its totient is φ = 18877543608000.

The previous prime is 20117557202429. The next prime is 20117557202513. The reversal of 20117557202461 is 16420275571102.

It is a cyclic number.

It is not a de Polignac number, because 20117557202461 - 2⁵ = 20117557202429 is a prime.

It is a super-2 number, since 2×20117557202461² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20117557202761) 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, 323928390 + ... + 323990488.

It is an arithmetic number, because the mean of its divisors is an integer number (668560651200).

Almost surely, 2^{20117557202461} is an apocalyptic number.

It is an amenable number.

20117557202461 is a deficient number, since it is larger than the sum of its proper divisors (1276383635939).

20117557202461 is a wasteful number, since it uses less digits than its factorization.

20117557202461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63177.

The product of its (nonzero) digits is 235200, while the sum is 43.

The spelling of 20117557202461 in words is "twenty trillion, one hundred seventeen billion, five hundred fifty-seven million, two hundred two thousand, four hundred sixty-one".