20360743981 has 2 divisors, whose sum is σ = 20360743982. Its totient is φ = 20360743980.

The previous prime is 20360743979. The next prime is 20360744017. The reversal of 20360743981 is 18934706302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20360721481 + 22500 = 142691^2 + 150^2 .

It is a cyclic number.

It is not a de Polignac number, because 20360743981 - 2¹ = 20360743979 is a prime.

It is a super-2 number, since 2×20360743981² (a number of 21 digits) contains 22 as substring.

Together with 20360743979, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20360746981) 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 as a sum of consecutive naturals, namely, 10180371990 + 10180371991.

It is an arithmetic number, because the mean of its divisors is an integer number (10180371991).

Almost surely, 2^20360743981 is an apocalyptic number.

It is an amenable number.

20360743981 is a deficient number, since it is larger than the sum of its proper divisors (1).

20360743981 is an equidigital number, since it uses as much as digits as its factorization.

20360743981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 217728, while the sum is 43.

The spelling of 20360743981 in words is "twenty billion, three hundred sixty million, seven hundred forty-three thousand, nine hundred eighty-one".