20057657 has 4 divisors (see below), whose sum is σ = 20087376. Its totient is φ = 20027940.

The previous prime is 20057629. The next prime is 20057659. The reversal of 20057657 is 75675002.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20057657 - 2²⁴ = 3280441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20057659) 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, 13823 + ... + 15204.

It is an arithmetic number, because the mean of its divisors is an integer number (5021844).

Almost surely, 2^20057657 is an apocalyptic number.

It is an amenable number.

20057657 is a deficient number, since it is larger than the sum of its proper divisors (29719).

20057657 is an equidigital number, since it uses as much as digits as its factorization.

20057657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29718.

The product of its (nonzero) digits is 14700, while the sum is 32.

The square root of 20057657 is about 4478.5775643613. The cubic root of 20057657 is about 271.7023533650.

The spelling of 20057657 in words is "twenty million, fifty-seven thousand, six hundred fifty-seven".