20017764552021 has 16 divisors (see below), whose sum is σ = 26901252139008. Its totient is φ = 13239732441600.

The previous prime is 20017764551989. The next prime is 20017764552031. The reversal of 20017764552021 is 12025546771002.

It is not a de Polignac number, because 20017764552021 - 2⁵ = 20017764551989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20017764552031) 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, 13531401 + ... + 14937681.

It is an arithmetic number, because the mean of its divisors is an integer number (1681328258688).

Almost surely, 2^{20017764552021} is an apocalyptic number.

It is an amenable number.

20017764552021 is a deficient number, since it is larger than the sum of its proper divisors (6883487586987).

20017764552021 is a wasteful number, since it uses less digits than its factorization.

20017764552021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1443772.

The product of its (nonzero) digits is 235200, while the sum is 42.

The spelling of 20017764552021 in words is "twenty trillion, seventeen billion, seven hundred sixty-four million, five hundred fifty-two thousand, twenty-one".