20320697 has 8 divisors (see below), whose sum is σ = 20684160. Its totient is φ = 19959520.

The previous prime is 20320687. The next prime is 20320711. The reversal of 20320697 is 79602302.

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

It is not a de Polignac number, because 20320697 - 2⁸ = 20320441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20320687) 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, 35429 + ... + 35997.

It is an arithmetic number, because the mean of its divisors is an integer number (2585520).

Almost surely, 2^20320697 is an apocalyptic number.

It is an amenable number.

20320697 is a deficient number, since it is larger than the sum of its proper divisors (363463).

20320697 is an equidigital number, since it uses as much as digits as its factorization.

20320697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1143.

The product of its (nonzero) digits is 4536, while the sum is 29.

The square root of 20320697 is about 4507.8483781068. The cubic root of 20320697 is about 272.8849179728.

Adding to 20320697 its reverse (79602302), we get a palindrome (99922999).

The spelling of 20320697 in words is "twenty million, three hundred twenty thousand, six hundred ninety-seven".