20524813 has 2 divisors, whose sum is σ = 20524814. Its totient is φ = 20524812.

The previous prime is 20524811. The next prime is 20524849. The reversal of 20524813 is 31842502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18852964 + 1671849 = 4342^2 + 1293^2 .

It is a cyclic number.

It is not a de Polignac number, because 20524813 - 2¹ = 20524811 is a prime.

Together with 20524811, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20524811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10262406 + 10262407.

It is an arithmetic number, because the mean of its divisors is an integer number (10262407).

Almost surely, 2^20524813 is an apocalyptic number.

It is an amenable number.

20524813 is a deficient number, since it is larger than the sum of its proper divisors (1).

20524813 is an equidigital number, since it uses as much as digits as its factorization.

20524813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 20524813 is about 4530.4318778677. The cubic root of 20524813 is about 273.7955611774.

The spelling of 20524813 in words is "twenty million, five hundred twenty-four thousand, eight hundred thirteen".