20717635874772 has 24 divisors (see below), whose sum is σ = 50442939521856. Its totient is φ = 6605623032448.

The previous prime is 20717635874731. The next prime is 20717635874777. The reversal of 20717635874772 is 27747853671702.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20717635874777) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37531948773 + ... + 37531949324.

It is an arithmetic number, because the mean of its divisors is an integer number (2101789146744).

Almost surely, 2^{20717635874772} is an apocalyptic number.

It is an amenable number.

20717635874772 is an abundant number, since it is smaller than the sum of its proper divisors (29725303647084).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20717635874772 is a wasteful number, since it uses less digits than its factorization.

20717635874772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75063898127 (or 75063898125 counting only the distinct ones).

The product of its (nonzero) digits is 193616640, while the sum is 66.

The spelling of 20717635874772 in words is "twenty trillion, seven hundred seventeen billion, six hundred thirty-five million, eight hundred seventy-four thousand, seven hundred seventy-two".