20702317 has 4 divisors (see below), whose sum is σ = 21416220. Its totient is φ = 19988416.

The previous prime is 20702303. The next prime is 20702329. The reversal of 20702317 is 71320702.

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 12574116 + 8128201 = 3546^2 + 2851^2 .

It is a cyclic number.

It is not a de Polignac number, because 20702317 - 2⁷ = 20702189 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 (20702347) 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, 356908 + ... + 356965.

It is an arithmetic number, because the mean of its divisors is an integer number (5354055).

Almost surely, 2^20702317 is an apocalyptic number.

It is an amenable number.

20702317 is a deficient number, since it is larger than the sum of its proper divisors (713903).

20702317 is an equidigital number, since it uses as much as digits as its factorization.

20702317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 713902.

The product of its (nonzero) digits is 588, while the sum is 22.

The square root of 20702317 is about 4549.9798900654. The cubic root of 20702317 is about 274.5825821561.

The spelling of 20702317 in words is "twenty million, seven hundred two thousand, three hundred seventeen".