20528737 has 2 divisors, whose sum is σ = 20528738. Its totient is φ = 20528736.

The previous prime is 20528713. The next prime is 20528743. The reversal of 20528737 is 73782502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20214016 + 314721 = 4496^2 + 561^2 .

It is a cyclic number.

It is not a de Polignac number, because 20528737 - 2¹¹ = 20526689 is a prime.

It is not a weakly prime, because it can be changed into another prime (20528777) 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, 10264368 + 10264369.

It is an arithmetic number, because the mean of its divisors is an integer number (10264369).

Almost surely, 2^20528737 is an apocalyptic number.

It is an amenable number.

20528737 is a deficient number, since it is larger than the sum of its proper divisors (1).

20528737 is an equidigital number, since it uses as much as digits as its factorization.

20528737 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23520, while the sum is 34.

The square root of 20528737 is about 4530.8649284656. The cubic root of 20528737 is about 273.8130084386.

The spelling of 20528737 in words is "twenty million, five hundred twenty-eight thousand, seven hundred thirty-seven".