20381033989 has 2 divisors, whose sum is σ = 20381033990. Its totient is φ = 20381033988.

The previous prime is 20381033963. The next prime is 20381033993. The reversal of 20381033989 is 98933018302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18072231489 + 2308802500 = 134433^2 + 48050^2 .

It is a cyclic number.

It is not a de Polignac number, because 20381033989 - 2¹⁹ = 20380509701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20381031989) by changing a digit.

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 as a sum of consecutive naturals, namely, 10190516994 + 10190516995.

It is an arithmetic number, because the mean of its divisors is an integer number (10190516995).

Almost surely, 2^20381033989 is an apocalyptic number.

It is an amenable number.

20381033989 is a deficient number, since it is larger than the sum of its proper divisors (1).

20381033989 is an equidigital number, since it uses as much as digits as its factorization.

20381033989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 279936, while the sum is 46.

The spelling of 20381033989 in words is "twenty billion, three hundred eighty-one million, thirty-three thousand, nine hundred eighty-nine".