20181697 has 8 divisors (see below), whose sum is σ = 20443136. Its totient is φ = 19922112.

The previous prime is 20181671. The next prime is 20181731. The reversal of 20181697 is 79618102.

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 20181697 - 2¹⁵ = 20148929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20181797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46393 + ... + 46825.

It is an arithmetic number, because the mean of its divisors is an integer number (2555392).

Almost surely, 2^20181697 is an apocalyptic number.

It is an amenable number.

20181697 is a deficient number, since it is larger than the sum of its proper divisors (261439).

20181697 is a wasteful number, since it uses less digits than its factorization.

20181697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 927.

The product of its (nonzero) digits is 6048, while the sum is 34.

The square root of 20181697 is about 4492.4043673739. The cubic root of 20181697 is about 272.2612874537.

Adding to 20181697 its reverse (79618102), we get a palindrome (99799799).

The spelling of 20181697 in words is "twenty million, one hundred eighty-one thousand, six hundred ninety-seven".