20576813 has 2 divisors, whose sum is σ = 20576814. Its totient is φ = 20576812.

The previous prime is 20576807. The next prime is 20576827. The reversal of 20576813 is 31867502.

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., 14115049 + 6461764 = 3757^2 + 2542^2 .

It is a cyclic number.

It is not a de Polignac number, because 20576813 - 2⁴ = 20576797 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20576813.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20576873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10288406 + 10288407.

It is an arithmetic number, because the mean of its divisors is an integer number (10288407).

Almost surely, 2^20576813 is an apocalyptic number.

It is an amenable number.

20576813 is a deficient number, since it is larger than the sum of its proper divisors (1).

20576813 is an equidigital number, since it uses as much as digits as its factorization.

20576813 is an odious number, because the sum of its binary digits is odd.

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

The square root of 20576813 is about 4536.1672147310. The cubic root of 20576813 is about 274.0265882523.

The spelling of 20576813 in words is "twenty million, five hundred seventy-six thousand, eight hundred thirteen".