20845537 has 2 divisors, whose sum is σ = 20845538. Its totient is φ = 20845536.

The previous prime is 20845523. The next prime is 20845543. The reversal of 20845537 is 73554802.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17969121 + 2876416 = 4239^2 + 1696^2 .

It is a cyclic number.

It is not a de Polignac number, because 20845537 - 2²³ = 12456929 is a prime.

It is not a weakly prime, because it can be changed into another prime (20840537) 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, 10422768 + 10422769.

It is an arithmetic number, because the mean of its divisors is an integer number (10422769).

Almost surely, 2^20845537 is an apocalyptic number.

It is an amenable number.

20845537 is a deficient number, since it is larger than the sum of its proper divisors (1).

20845537 is an equidigital number, since it uses as much as digits as its factorization.

20845537 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 33600, while the sum is 34.

The square root of 20845537 is about 4565.6912948643. The cubic root of 20845537 is about 275.2143210799.

The spelling of 20845537 in words is "twenty million, eight hundred forty-five thousand, five hundred thirty-seven".