20513029 has 2 divisors, whose sum is σ = 20513030. Its totient is φ = 20513028.

The previous prime is 20513011. The next prime is 20513039. The reversal of 20513029 is 92031502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20268004 + 245025 = 4502^2 + 495^2 .

It is a cyclic number.

It is not a de Polignac number, because 20513029 - 2⁹ = 20512517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20513039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10256514 + 10256515.

It is an arithmetic number, because the mean of its divisors is an integer number (10256515).

Almost surely, 2^20513029 is an apocalyptic number.

It is an amenable number.

20513029 is a deficient number, since it is larger than the sum of its proper divisors (1).

20513029 is an equidigital number, since it uses as much as digits as its factorization.

20513029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 20513029 is about 4529.1311528813. The cubic root of 20513029 is about 273.7431526682.

The spelling of 20513029 in words is "twenty million, five hundred thirteen thousand, twenty-nine".