20525399 has 2 divisors, whose sum is σ = 20525400. Its totient is φ = 20525398.

The previous prime is 20525389. The next prime is 20525411. The reversal of 20525399 is 99352502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20525399 - 2¹⁶ = 20459863 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20525369) 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, 10262699 + 10262700.

It is an arithmetic number, because the mean of its divisors is an integer number (10262700).

Almost surely, 2^20525399 is an apocalyptic number.

20525399 is a deficient number, since it is larger than the sum of its proper divisors (1).

20525399 is an equidigital number, since it uses as much as digits as its factorization.

20525399 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24300, while the sum is 35.

The square root of 20525399 is about 4530.4965511520. The cubic root of 20525399 is about 273.7981668475.

The spelling of 20525399 in words is "twenty million, five hundred twenty-five thousand, three hundred ninety-nine".