20057717 has 2 divisors, whose sum is σ = 20057718. Its totient is φ = 20057716.

The previous prime is 20057683. The next prime is 20057729. The reversal of 20057717 is 71775002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18957316 + 1100401 = 4354^2 + 1049^2 .

It is a cyclic number.

It is not a de Polignac number, because 20057717 - 2⁸ = 20057461 is a prime.

It is a super-2 number, since 2×20057717² = 804624022504178, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20057717.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20057777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10028858 + 10028859.

It is an arithmetic number, because the mean of its divisors is an integer number (10028859).

Almost surely, 2^20057717 is an apocalyptic number.

It is an amenable number.

20057717 is a deficient number, since it is larger than the sum of its proper divisors (1).

20057717 is an equidigital number, since it uses as much as digits as its factorization.

20057717 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3430, while the sum is 29.

The square root of 20057717 is about 4478.5842629117. The cubic root of 20057717 is about 271.7026242860.

The spelling of 20057717 in words is "twenty million, fifty-seven thousand, seven hundred seventeen".