20525971 has 2 divisors, whose sum is σ = 20525972. Its totient is φ = 20525970.

The previous prime is 20525941. The next prime is 20526031. The reversal of 20525971 is 17952502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20525971 - 2⁹ = 20525459 is a prime.

It is not a weakly prime, because it can be changed into another prime (20525941) 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, 10262985 + 10262986.

It is an arithmetic number, because the mean of its divisors is an integer number (10262986).

Almost surely, 2^20525971 is an apocalyptic number.

20525971 is a deficient number, since it is larger than the sum of its proper divisors (1).

20525971 is an equidigital number, since it uses as much as digits as its factorization.

20525971 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6300, while the sum is 31.

The square root of 20525971 is about 4530.5596784503. The cubic root of 20525971 is about 273.8007102182.

The spelling of 20525971 in words is "twenty million, five hundred twenty-five thousand, nine hundred seventy-one".