20538506634629 has 2 divisors, whose sum is σ = 20538506634630. Its totient is φ = 20538506634628.

The previous prime is 20538506634599. The next prime is 20538506634647. The reversal of 20538506634629 is 92643660583502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20268922418404 + 269584216225 = 4502102^2 + 519215^2 .

It is a cyclic number.

It is not a de Polignac number, because 20538506634629 - 2³⁶ = 20469787157893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20538506634229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10269253317314 + 10269253317315.

It is an arithmetic number, because the mean of its divisors is an integer number (10269253317315).

Almost surely, 2^{20538506634629} is an apocalyptic number.

It is an amenable number.

20538506634629 is a deficient number, since it is larger than the sum of its proper divisors (1).

20538506634629 is an equidigital number, since it uses as much as digits as its factorization.

20538506634629 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 55987200, while the sum is 59.

The spelling of 20538506634629 in words is "twenty trillion, five hundred thirty-eight billion, five hundred six million, six hundred thirty-four thousand, six hundred twenty-nine".