20972137489922 has 8 divisors (see below), whose sum is σ = 33308688954636. Its totient is φ = 9869241171712.

The previous prime is 20972137489913. The next prime is 20972137490047. The reversal of 20972137489922 is 22998473127902.

It can be written as a sum of positive squares in 2 ways, for example, as 19789766147761 + 1182371342161 = 4448569^2 + 1087369^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 308413786583 + ... + 308413786650.

Almost surely, 2^{20972137489922} is an apocalyptic number.

20972137489922 is a deficient number, since it is larger than the sum of its proper divisors (12336551464714).

20972137489922 is a wasteful number, since it uses less digits than its factorization.

20972137489922 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 616827573252.

The product of its (nonzero) digits is 54867456, while the sum is 65.

The spelling of 20972137489922 in words is "twenty trillion, nine hundred seventy-two billion, one hundred thirty-seven million, four hundred eighty-nine thousand, nine hundred twenty-two".