20752729 has 2 divisors, whose sum is σ = 20752730. Its totient is φ = 20752728.

The previous prime is 20752727. The next prime is 20752741. The reversal of 20752729 is 92725702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18079504 + 2673225 = 4252^2 + 1635^2 .

It is a cyclic number.

It is not a de Polignac number, because 20752729 - 2¹ = 20752727 is a prime.

Together with 20752727, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 20752694 and 20752703.

It is not a weakly prime, because it can be changed into another prime (20752727) 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, 10376364 + 10376365.

It is an arithmetic number, because the mean of its divisors is an integer number (10376365).

Almost surely, 2^20752729 is an apocalyptic number.

It is an amenable number.

20752729 is a deficient number, since it is larger than the sum of its proper divisors (1).

20752729 is an equidigital number, since it uses as much as digits as its factorization.

20752729 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17640, while the sum is 34.

The square root of 20752729 is about 4555.5163263894. The cubic root of 20752729 is about 274.8052792354.

The spelling of 20752729 in words is "twenty million, seven hundred fifty-two thousand, seven hundred twenty-nine".