20510713 has 2 divisors, whose sum is σ = 20510714. Its totient is φ = 20510712.

The previous prime is 20510683. The next prime is 20510719. The reversal of 20510713 is 31701502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16621929 + 3888784 = 4077^2 + 1972^2 .

It is a cyclic number.

It is not a de Polignac number, because 20510713 - 2⁹ = 20510201 is a prime.

It is not a weakly prime, because it can be changed into another prime (20510719) 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, 10255356 + 10255357.

It is an arithmetic number, because the mean of its divisors is an integer number (10255357).

Almost surely, 2^20510713 is an apocalyptic number.

It is an amenable number.

20510713 is a deficient number, since it is larger than the sum of its proper divisors (1).

20510713 is an equidigital number, since it uses as much as digits as its factorization.

20510713 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 210, while the sum is 19.

The square root of 20510713 is about 4528.8754674864. The cubic root of 20510713 is about 273.7328500616.

It can be divided in two parts, 205107 and 13, that added together give a triangular number (205120 = T₆₄₀).

The spelling of 20510713 in words is "twenty million, five hundred ten thousand, seven hundred thirteen".