20694184873 has 2 divisors, whose sum is σ = 20694184874. Its totient is φ = 20694184872.

The previous prime is 20694184829. The next prime is 20694184937. The reversal of 20694184873 is 37848149602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18060134544 + 2634050329 = 134388^2 + 51323^2 .

It is a cyclic number.

It is not a de Polignac number, because 20694184873 - 2²¹ = 20692087721 is a prime.

It is a super-2 number, since 2×20694184873² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20694184873.

It is not a weakly prime, because it can be changed into another prime (20694184673) 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, 10347092436 + 10347092437.

It is an arithmetic number, because the mean of its divisors is an integer number (10347092437).

Almost surely, 2^20694184873 is an apocalyptic number.

It is an amenable number.

20694184873 is a deficient number, since it is larger than the sum of its proper divisors (1).

20694184873 is an equidigital number, since it uses as much as digits as its factorization.

20694184873 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2322432, while the sum is 52.

The spelling of 20694184873 in words is "twenty billion, six hundred ninety-four million, one hundred eighty-four thousand, eight hundred seventy-three".