20528647 has 2 divisors, whose sum is σ = 20528648. Its totient is φ = 20528646.

The previous prime is 20528623. The next prime is 20528653. The reversal of 20528647 is 74682502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20528647 - 2²³ = 12140039 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20528657) 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, 10264323 + 10264324.

It is an arithmetic number, because the mean of its divisors is an integer number (10264324).

Almost surely, 2^20528647 is an apocalyptic number.

20528647 is a deficient number, since it is larger than the sum of its proper divisors (1).

20528647 is an equidigital number, since it uses as much as digits as its factorization.

20528647 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26880, while the sum is 34.

The square root of 20528647 is about 4530.8549965763. The cubic root of 20528647 is about 273.8126082970.

The spelling of 20528647 in words is "twenty million, five hundred twenty-eight thousand, six hundred forty-seven".