20525497 has 2 divisors, whose sum is σ = 20525498. Its totient is φ = 20525496.

The previous prime is 20525459. The next prime is 20525501. The reversal of 20525497 is 79452502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19971961 + 553536 = 4469^2 + 744^2 .

It is a cyclic number.

It is not a de Polignac number, because 20525497 - 2⁷ = 20525369 is a prime.

It is not a weakly prime, because it can be changed into another prime (20525437) 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, 10262748 + 10262749.

It is an arithmetic number, because the mean of its divisors is an integer number (10262749).

Almost surely, 2^20525497 is an apocalyptic number.

It is an amenable number.

20525497 is a deficient number, since it is larger than the sum of its proper divisors (1).

20525497 is an equidigital number, since it uses as much as digits as its factorization.

20525497 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25200, while the sum is 34.

The square root of 20525497 is about 4530.5073667306. The cubic root of 20525497 is about 273.7986026031.

Adding to 20525497 its reverse (79452502), we get a palindrome (99977999).

The spelling of 20525497 in words is "twenty million, five hundred twenty-five thousand, four hundred ninety-seven".