20012332981 has 2 divisors, whose sum is σ = 20012332982. Its totient is φ = 20012332980.

The previous prime is 20012332961. The next prime is 20012333039. The reversal of 20012332981 is 18923321002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18721080625 + 1291252356 = 136825^2 + 35934^2 .

It is a cyclic number.

It is not a de Polignac number, because 20012332981 - 2⁹ = 20012332469 is a prime.

It is a super-2 number, since 2×20012332981² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20012332961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10006166490 + 10006166491.

It is an arithmetic number, because the mean of its divisors is an integer number (10006166491).

Almost surely, 2^20012332981 is an apocalyptic number.

It is an amenable number.

20012332981 is a deficient number, since it is larger than the sum of its proper divisors (1).

20012332981 is an equidigital number, since it uses as much as digits as its factorization.

20012332981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 31.

Adding to 20012332981 its reverse (18923321002), we get a palindrome (38935653983).

The spelling of 20012332981 in words is "twenty billion, twelve million, three hundred thirty-two thousand, nine hundred eighty-one".