20636315437 has 2 divisors, whose sum is σ = 20636315438. Its totient is φ = 20636315436.

The previous prime is 20636315411. The next prime is 20636315467. The reversal of 20636315437 is 73451363602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15839229316 + 4797086121 = 125854^2 + 69261^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20636315437 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20636315437.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20636315467) 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, 10318157718 + 10318157719.

It is an arithmetic number, because the mean of its divisors is an integer number (10318157719).

Almost surely, 2^20636315437 is an apocalyptic number.

It is an amenable number.

20636315437 is a deficient number, since it is larger than the sum of its proper divisors (1).

20636315437 is an equidigital number, since it uses as much as digits as its factorization.

20636315437 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 272160, while the sum is 40.

The spelling of 20636315437 in words is "twenty billion, six hundred thirty-six million, three hundred fifteen thousand, four hundred thirty-seven".