20057897 has 4 divisors (see below), whose sum is σ = 20547156. Its totient is φ = 19568640.

The previous prime is 20057887. The next prime is 20057927. The reversal of 20057897 is 79875002.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2785561 + 17272336 = 1669^2 + 4156^2 .

It is a cyclic number.

It is not a de Polignac number, because 20057897 - 2⁶ = 20057833 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20057897.

It is not an unprimeable number, because it can be changed into a prime (20057887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 244568 + ... + 244649.

It is an arithmetic number, because the mean of its divisors is an integer number (5136789).

Almost surely, 2^20057897 is an apocalyptic number.

It is an amenable number.

20057897 is a deficient number, since it is larger than the sum of its proper divisors (489259).

20057897 is an equidigital number, since it uses as much as digits as its factorization.

20057897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 489258.

The product of its (nonzero) digits is 35280, while the sum is 38.

The square root of 20057897 is about 4478.6043585028. The cubic root of 20057897 is about 271.7034370459.

The spelling of 20057897 in words is "twenty million, fifty-seven thousand, eight hundred ninety-seven".