20675813 has 2 divisors, whose sum is σ = 20675814. Its totient is φ = 20675812.

The previous prime is 20675797. The next prime is 20675917. The reversal of 20675813 is 31857602.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20593444 + 82369 = 4538^2 + 287^2 .

It is a cyclic number.

It is not a de Polignac number, because 20675813 - 2⁴ = 20675797 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20675813.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20675113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10337906 + 10337907.

It is an arithmetic number, because the mean of its divisors is an integer number (10337907).

Almost surely, 2^20675813 is an apocalyptic number.

It is an amenable number.

20675813 is a deficient number, since it is larger than the sum of its proper divisors (1).

20675813 is an equidigital number, since it uses as much as digits as its factorization.

20675813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 20675813 is about 4547.0664169330. The cubic root of 20675813 is about 274.4653546232.

The spelling of 20675813 in words is "twenty million, six hundred seventy-five thousand, eight hundred thirteen".