20888317 has 4 divisors (see below), whose sum is σ = 20897856. Its totient is φ = 20878780.

The previous prime is 20888299. The next prime is 20888321. The reversal of 20888317 is 71388802.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 71388802 = 2 ⋅35694401.

It is a cyclic number.

It is not a de Polignac number, because 20888317 - 2¹¹ = 20886269 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20888377) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 342 + ... + 6472.

It is an arithmetic number, because the mean of its divisors is an integer number (5224464).

Almost surely, 2^20888317 is an apocalyptic number.

It is an amenable number.

20888317 is a deficient number, since it is larger than the sum of its proper divisors (9539).

20888317 is an equidigital number, since it uses as much as digits as its factorization.

20888317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9538.

The product of its (nonzero) digits is 21504, while the sum is 37.

The square root of 20888317 is about 4570.3738359132. The cubic root of 20888317 is about 275.4024608514.

The spelling of 20888317 in words is "twenty million, eight hundred eighty-eight thousand, three hundred seventeen".