20512193077 has 2 divisors, whose sum is σ = 20512193078. Its totient is φ = 20512193076.

The previous prime is 20512193059. The next prime is 20512193111. The reversal of 20512193077 is 77039121502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20496503556 + 15689521 = 143166^2 + 3961^2 .

It is a cyclic number.

It is not a de Polignac number, because 20512193077 - 2¹⁵ = 20512160309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20512196077) 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, 10256096538 + 10256096539.

It is an arithmetic number, because the mean of its divisors is an integer number (10256096539).

Almost surely, 2^20512193077 is an apocalyptic number.

It is an amenable number.

20512193077 is a deficient number, since it is larger than the sum of its proper divisors (1).

20512193077 is an equidigital number, since it uses as much as digits as its factorization.

20512193077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26460, while the sum is 37.

The spelling of 20512193077 in words is "twenty billion, five hundred twelve million, one hundred ninety-three thousand, seventy-seven".