20428696273 has 2 divisors, whose sum is σ = 20428696274. Its totient is φ = 20428696272.

The previous prime is 20428696261. The next prime is 20428696283. The reversal of 20428696273 is 37269682402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17951444289 + 2477251984 = 133983^2 + 49772^2 .

It is a cyclic number.

It is not a de Polignac number, because 20428696273 - 2⁹ = 20428695761 is a prime.

It is not a weakly prime, because it can be changed into another prime (20428696283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10214348136 + 10214348137.

It is an arithmetic number, because the mean of its divisors is an integer number (10214348137).

Almost surely, 2^20428696273 is an apocalyptic number.

It is an amenable number.

20428696273 is a deficient number, since it is larger than the sum of its proper divisors (1).

20428696273 is an equidigital number, since it uses as much as digits as its factorization.

20428696273 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1741824, while the sum is 49.

The spelling of 20428696273 in words is "twenty billion, four hundred twenty-eight million, six hundred ninety-six thousand, two hundred seventy-three".