20001971765973 has 8 divisors (see below), whose sum is σ = 28238077787328. Its totient is φ = 12550256794304.

The previous prime is 20001971765959. The next prime is 20001971765989. The reversal of 20001971765973 is 37956717910002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20001971765973 - 2²⁹ = 20001434895061 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20001971765953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 196097762361 + ... + 196097762462.

It is an arithmetic number, because the mean of its divisors is an integer number (3529759723416).

Almost surely, 2^{20001971765973} is an apocalyptic number.

It is an amenable number.

20001971765973 is a deficient number, since it is larger than the sum of its proper divisors (8236106021355).

20001971765973 is a wasteful number, since it uses less digits than its factorization.

20001971765973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 392195524843.

The product of its (nonzero) digits is 5000940, while the sum is 57.

The spelling of 20001971765973 in words is "twenty trillion, one billion, nine hundred seventy-one million, seven hundred sixty-five thousand, nine hundred seventy-three".