20490956573 has 2 divisors, whose sum is σ = 20490956574. Its totient is φ = 20490956572.

The previous prime is 20490956533. The next prime is 20490956593. The reversal of 20490956573 is 37565909402.

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., 14332160089 + 6158796484 = 119717^2 + 78478^2 .

It is a cyclic number.

It is not a de Polignac number, because 20490956573 - 2⁶ = 20490956509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20490956533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10245478286 + 10245478287.

It is an arithmetic number, because the mean of its divisors is an integer number (10245478287).

Almost surely, 2^20490956573 is an apocalyptic number.

It is an amenable number.

20490956573 is a deficient number, since it is larger than the sum of its proper divisors (1).

20490956573 is an equidigital number, since it uses as much as digits as its factorization.

20490956573 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2041200, while the sum is 50.

The spelling of 20490956573 in words is "twenty billion, four hundred ninety million, nine hundred fifty-six thousand, five hundred seventy-three".