20525801 has 2 divisors, whose sum is σ = 20525802. Its totient is φ = 20525800.

The previous prime is 20525797. The next prime is 20525809. The reversal of 20525801 is 10852502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20475625 + 50176 = 4525^2 + 224^2 .

It is a cyclic number.

It is not a de Polignac number, because 20525801 - 2² = 20525797 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (20525809) 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, 10262900 + 10262901.

It is an arithmetic number, because the mean of its divisors is an integer number (10262901).

Almost surely, 2^20525801 is an apocalyptic number.

It is an amenable number.

20525801 is a deficient number, since it is larger than the sum of its proper divisors (1).

20525801 is an equidigital number, since it uses as much as digits as its factorization.

20525801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 20525801 is about 4530.5409169325. The cubic root of 20525801 is about 273.7999543262.

The spelling of 20525801 in words is "twenty million, five hundred twenty-five thousand, eight hundred one".