20430101977 has 2 divisors, whose sum is σ = 20430101978. Its totient is φ = 20430101976.

The previous prime is 20430101963. The next prime is 20430102023. The reversal of 20430101977 is 77910103402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16155426816 + 4274675161 = 127104^2 + 65381^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20430101977 is a prime.

It is not a weakly prime, because it can be changed into another prime (20430101777) 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, 10215050988 + 10215050989.

It is an arithmetic number, because the mean of its divisors is an integer number (10215050989).

Almost surely, 2^20430101977 is an apocalyptic number.

It is an amenable number.

20430101977 is a deficient number, since it is larger than the sum of its proper divisors (1).

20430101977 is an equidigital number, since it uses as much as digits as its factorization.

20430101977 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10584, while the sum is 34.

The spelling of 20430101977 in words is "twenty billion, four hundred thirty million, one hundred one thousand, nine hundred seventy-seven".