20330439977 has 2 divisors, whose sum is σ = 20330439978. Its totient is φ = 20330439976.

The previous prime is 20330439953. The next prime is 20330440007. The reversal of 20330439977 is 77993403302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20317936681 + 12503296 = 142541^2 + 3536^2 .

It is a cyclic number.

It is not a de Polignac number, because 20330439977 - 2³² = 16035472681 is a prime.

It is not a weakly prime, because it can be changed into another prime (20330439917) 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, 10165219988 + 10165219989.

It is an arithmetic number, because the mean of its divisors is an integer number (10165219989).

Almost surely, 2^20330439977 is an apocalyptic number.

It is an amenable number.

20330439977 is a deficient number, since it is larger than the sum of its proper divisors (1).

20330439977 is an equidigital number, since it uses as much as digits as its factorization.

20330439977 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 857304, while the sum is 47.

The spelling of 20330439977 in words is "twenty billion, three hundred thirty million, four hundred thirty-nine thousand, nine hundred seventy-seven".