20317755361 has 2 divisors, whose sum is σ = 20317755362. Its totient is φ = 20317755360.

The previous prime is 20317755329. The next prime is 20317755371. The reversal of 20317755361 is 16355771302.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10469177761 + 9848577600 = 102319^2 + 99240^2 .

It is a cyclic number.

It is not a de Polignac number, because 20317755361 - 2⁵ = 20317755329 is a prime.

It is a super-2 number, since 2×20317755361² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20317755301) 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, 10158877680 + 10158877681.

It is an arithmetic number, because the mean of its divisors is an integer number (10158877681).

Almost surely, 2^20317755361 is an apocalyptic number.

It is an amenable number.

20317755361 is a deficient number, since it is larger than the sum of its proper divisors (1).

20317755361 is an equidigital number, since it uses as much as digits as its factorization.

20317755361 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 132300, while the sum is 40.

The spelling of 20317755361 in words is "twenty billion, three hundred seventeen million, seven hundred fifty-five thousand, three hundred sixty-one".