20555371693 has 2 divisors, whose sum is σ = 20555371694. Its totient is φ = 20555371692.

The previous prime is 20555371679. The next prime is 20555371747. The reversal of 20555371693 is 39617355502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16466792329 + 4088579364 = 128323^2 + 63942^2 .

It is a cyclic number.

It is not a de Polignac number, because 20555371693 - 2²⁹ = 20018500781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20555371663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10277685846 + 10277685847.

It is an arithmetic number, because the mean of its divisors is an integer number (10277685847).

Almost surely, 2^20555371693 is an apocalyptic number.

It is an amenable number.

20555371693 is a deficient number, since it is larger than the sum of its proper divisors (1).

20555371693 is an equidigital number, since it uses as much as digits as its factorization.

20555371693 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 850500, while the sum is 46.

The spelling of 20555371693 in words is "twenty billion, five hundred fifty-five million, three hundred seventy-one thousand, six hundred ninety-three".