20642835660471 has 12 divisors (see below), whose sum is σ = 29862675774360. Its totient is φ = 13741007446320.

The previous prime is 20642835660451. The next prime is 20642835660481. The reversal of 20642835660471 is 17406653824602.

20642835660471 is a `hidden beast` number, since 2 + 0 + 6 + 4 + 2 + 8 + 3 + 566 + 0 + 4 + 71 = 666.

It is not a de Polignac number, because 20642835660471 - 2²⁶ = 20642768551607 is a prime.

It is a super-3 number, since 3×20642835660471³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20642835660451) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1740243240 + ... + 1740255101.

It is an arithmetic number, because the mean of its divisors is an integer number (2488556314530).

Almost surely, 2^{20642835660471} is an apocalyptic number.

20642835660471 is a deficient number, since it is larger than the sum of its proper divisors (9219840113889).

20642835660471 is a wasteful number, since it uses less digits than its factorization.

20642835660471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3480499006 (or 3480499003 counting only the distinct ones).

The product of its (nonzero) digits is 11612160, while the sum is 54.

The spelling of 20642835660471 in words is "twenty trillion, six hundred forty-two billion, eight hundred thirty-five million, six hundred sixty thousand, four hundred seventy-one".