20706317 has 4 divisors (see below), whose sum is σ = 20857596. Its totient is φ = 20555040.

The previous prime is 20706311. The next prime is 20706341. The reversal of 20706317 is 71360702.

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 16152361 + 4553956 = 4019^2 + 2134^2 .

It is a cyclic number.

It is not a de Polignac number, because 20706317 - 2⁸ = 20706061 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 (20706311) 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, 75434 + ... + 75707.

It is an arithmetic number, because the mean of its divisors is an integer number (5214399).

Almost surely, 2^20706317 is an apocalyptic number.

It is an amenable number.

20706317 is a deficient number, since it is larger than the sum of its proper divisors (151279).

20706317 is a wasteful number, since it uses less digits than its factorization.

20706317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151278.

The product of its (nonzero) digits is 1764, while the sum is 26.

The square root of 20706317 is about 4550.4194312173. The cubic root of 20706317 is about 274.6002655165.

The spelling of 20706317 in words is "twenty million, seven hundred six thousand, three hundred seventeen".