20320890371161 has 2 divisors, whose sum is σ = 20320890371162. Its totient is φ = 20320890371160.

The previous prime is 20320890371141. The next prime is 20320890371213. The reversal of 20320890371161 is 16117309802302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17310425936400 + 3010464434761 = 4160580^2 + 1735069^2 .

It is a cyclic number.

It is not a de Polignac number, because 20320890371161 - 2²¹ = 20320888274009 is a prime.

It is not a weakly prime, because it can be changed into another prime (20320890371141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10160445185580 + 10160445185581.

It is an arithmetic number, because the mean of its divisors is an integer number (10160445185581).

Almost surely, 2^{20320890371161} is an apocalyptic number.

It is an amenable number.

20320890371161 is a deficient number, since it is larger than the sum of its proper divisors (1).

20320890371161 is an equidigital number, since it uses as much as digits as its factorization.

20320890371161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108864, while the sum is 43.

The spelling of 20320890371161 in words is "twenty trillion, three hundred twenty billion, eight hundred ninety million, three hundred seventy-one thousand, one hundred sixty-one".