20877950328817 has 2 divisors, whose sum is σ = 20877950328818. Its totient is φ = 20877950328816.

The previous prime is 20877950328799. The next prime is 20877950328869. The reversal of 20877950328817 is 71882305977802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13578016346896 + 7299933981921 = 3684836^2 + 2701839^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20877950328817 is a prime.

It is not a weakly prime, because it can be changed into another prime (20877950398817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10438975164408 + 10438975164409.

It is an arithmetic number, because the mean of its divisors is an integer number (10438975164409).

Almost surely, 2^{20877950328817} is an apocalyptic number.

It is an amenable number.

20877950328817 is a deficient number, since it is larger than the sum of its proper divisors (1).

20877950328817 is an equidigital number, since it uses as much as digits as its factorization.

20877950328817 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 94832640, while the sum is 67.

The spelling of 20877950328817 in words is "twenty trillion, eight hundred seventy-seven billion, nine hundred fifty million, three hundred twenty-eight thousand, eight hundred seventeen".