20352320431981 has 2 divisors, whose sum is σ = 20352320431982. Its totient is φ = 20352320431980.

The previous prime is 20352320431951. The next prime is 20352320432047. The reversal of 20352320431981 is 18913402325302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19929670918756 + 422649513225 = 4464266^2 + 650115^2 .

It is a cyclic number.

It is not a de Polignac number, because 20352320431981 - 2⁷ = 20352320431853 is a prime.

It is a super-2 number, since 2×20352320431981² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20352320431951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10176160215990 + 10176160215991.

It is an arithmetic number, because the mean of its divisors is an integer number (10176160215991).

Almost surely, 2^{20352320431981} is an apocalyptic number.

It is an amenable number.

20352320431981 is a deficient number, since it is larger than the sum of its proper divisors (1).

20352320431981 is an equidigital number, since it uses as much as digits as its factorization.

20352320431981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 311040, while the sum is 43.

The spelling of 20352320431981 in words is "twenty trillion, three hundred fifty-two billion, three hundred twenty million, four hundred thirty-one thousand, nine hundred eighty-one".