20731317 has 8 divisors (see below), whose sum is σ = 28595040. Its totient is φ = 13344240.

The previous prime is 20731309. The next prime is 20731327. The reversal of 20731317 is 71313702.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20731317 - 2³ = 20731309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20731307) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 119059 + ... + 119232.

It is an arithmetic number, because the mean of its divisors is an integer number (3574380).

Almost surely, 2^20731317 is an apocalyptic number.

It is an amenable number.

20731317 is a deficient number, since it is larger than the sum of its proper divisors (7863723).

20731317 is a wasteful number, since it uses less digits than its factorization.

20731317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238323.

The product of its (nonzero) digits is 882, while the sum is 24.

The square root of 20731317 is about 4553.1656020839. The cubic root of 20731317 is about 274.7107349551.

The spelling of 20731317 in words is "twenty million, seven hundred thirty-one thousand, three hundred seventeen".