20221716887172 has 18 divisors (see below), whose sum is σ = 51116006575998. Its totient is φ = 6740572295712.

The previous prime is 20221716887149. The next prime is 20221716887179. The reversal of 20221716887172 is 27178861712202.

20221716887172 is a `hidden beast` number, since 20 + 2 + 217 + 168 + 87 + 172 = 666.

It can be written as a sum of positive squares in only one way, i.e., 19516479720516 + 705237166656 = 4417746^2 + 839784^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (20221716887179) 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 5 ways as a sum of consecutive naturals, for example, 280857178953 + ... + 280857179024.

It is an arithmetic number, because the mean of its divisors is an integer number (2839778143111).

Almost surely, 2^{20221716887172} is an apocalyptic number.

It is an amenable number.

20221716887172 is an abundant number, since it is smaller than the sum of its proper divisors (30894289688826).

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

20221716887172 is a wasteful number, since it uses less digits than its factorization.

20221716887172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 561714357987 (or 561714357982 counting only the distinct ones).

The product of its (nonzero) digits is 2107392, while the sum is 54.

The spelling of 20221716887172 in words is "twenty trillion, two hundred twenty-one billion, seven hundred sixteen million, eight hundred eighty-seven thousand, one hundred seventy-two".