20057971 has 2 divisors, whose sum is σ = 20057972. Its totient is φ = 20057970.

The previous prime is 20057963. The next prime is 20057981. The reversal of 20057971 is 17975002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20057971 - 2³ = 20057963 is a prime.

It is not a weakly prime, because it can be changed into another prime (20057941) 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, 10028985 + 10028986.

It is an arithmetic number, because the mean of its divisors is an integer number (10028986).

Almost surely, 2^20057971 is an apocalyptic number.

20057971 is a deficient number, since it is larger than the sum of its proper divisors (1).

20057971 is an equidigital number, since it uses as much as digits as its factorization.

20057971 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4410, while the sum is 31.

The square root of 20057971 is about 4478.6126199974. The cubic root of 20057971 is about 271.7037711792.

The spelling of 20057971 in words is "twenty million, fifty-seven thousand, nine hundred seventy-one".