20117023661471 has 16 divisors (see below), whose sum is σ = 21968091014688. Its totient is φ = 18269671056000.

The previous prime is 20117023661447. The next prime is 20117023661473. The reversal of 20117023661471 is 17416632071102.

It is a cyclic number.

It is not a de Polignac number, because 20117023661471 - 2³⁸ = 19842145754527 is a prime.

It is a super-3 number, since 3×20117023661471³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20117023661473) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58977305 + ... + 59317421.

It is an arithmetic number, because the mean of its divisors is an integer number (1373005688418).

Almost surely, 2^{20117023661471} is an apocalyptic number.

20117023661471 is a deficient number, since it is larger than the sum of its proper divisors (1851067353217).

20117023661471 is a wasteful number, since it uses less digits than its factorization.

20117023661471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345562.

The product of its (nonzero) digits is 84672, while the sum is 41.

The spelling of 20117023661471 in words is "twenty trillion, one hundred seventeen billion, twenty-three million, six hundred sixty-one thousand, four hundred seventy-one".