20675513 has 2 divisors, whose sum is σ = 20675514. Its totient is φ = 20675512.

The previous prime is 20675509. The next prime is 20675527. The reversal of 20675513 is 31557602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12306064 + 8369449 = 3508^2 + 2893^2 .

It is a cyclic number.

It is not a de Polignac number, because 20675513 - 2² = 20675509 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (20675533) 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, 10337756 + 10337757.

It is an arithmetic number, because the mean of its divisors is an integer number (10337757).

Almost surely, 2^20675513 is an apocalyptic number.

It is an amenable number.

20675513 is a deficient number, since it is larger than the sum of its proper divisors (1).

20675513 is an equidigital number, since it uses as much as digits as its factorization.

20675513 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6300, while the sum is 29.

The square root of 20675513 is about 4547.0334285114. The cubic root of 20675513 is about 274.4640271461.

The spelling of 20675513 in words is "twenty million, six hundred seventy-five thousand, five hundred thirteen".