20170397 has 8 divisors (see below), whose sum is σ = 22227744. Its totient is φ = 18185328.

The previous prime is 20170391. The next prime is 20170421. The reversal of 20170397 is 79307102.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 20170397 - 2⁸ = 20170141 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 (20170391) 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, 17483 + ... + 18600.

It is an arithmetic number, because the mean of its divisors is an integer number (2778468).

Almost surely, 2^20170397 is an apocalyptic number.

It is an amenable number.

20170397 is a deficient number, since it is larger than the sum of its proper divisors (2057347).

20170397 is a wasteful number, since it uses less digits than its factorization.

20170397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36139.

The product of its (nonzero) digits is 2646, while the sum is 29.

The square root of 20170397 is about 4491.1465128628. The cubic root of 20170397 is about 272.2104637308.

Adding to 20170397 its reverse (79307102), we get a palindrome (99477499).

The spelling of 20170397 in words is "twenty million, one hundred seventy thousand, three hundred ninety-seven".