20519713 has 2 divisors, whose sum is σ = 20519714. Its totient is φ = 20519712.

The previous prime is 20519701. The next prime is 20519747. The reversal of 20519713 is 31791502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16744464 + 3775249 = 4092^2 + 1943^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20519713 is a prime.

It is not a weakly prime, because it can be changed into another prime (20519773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10259856 + 10259857.

It is an arithmetic number, because the mean of its divisors is an integer number (10259857).

Almost surely, 2^20519713 is an apocalyptic number.

It is an amenable number.

20519713 is a deficient number, since it is larger than the sum of its proper divisors (1).

20519713 is an equidigital number, since it uses as much as digits as its factorization.

20519713 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1890, while the sum is 28.

The square root of 20519713 is about 4529.8689826528. The cubic root of 20519713 is about 273.7728817498.

The spelling of 20519713 in words is "twenty million, five hundred nineteen thousand, seven hundred thirteen".