20744197 has 4 divisors (see below), whose sum is σ = 20938176. Its totient is φ = 20550220.

The previous prime is 20744173. The next prime is 20744231. The reversal of 20744197 is 79144702.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20744197 - 2²³ = 12355589 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 (20744167) 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, 96829 + ... + 97042.

It is an arithmetic number, because the mean of its divisors is an integer number (5234544).

Almost surely, 2^20744197 is an apocalyptic number.

It is an amenable number.

20744197 is a deficient number, since it is larger than the sum of its proper divisors (193979).

20744197 is a wasteful number, since it uses less digits than its factorization.

20744197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193978.

The product of its (nonzero) digits is 14112, while the sum is 34.

The square root of 20744197 is about 4554.5797830316. The cubic root of 20744197 is about 274.7676141484.

Adding to 20744197 its reverse (79144702), we get a palindrome (99888899).

The spelling of 20744197 in words is "twenty million, seven hundred forty-four thousand, one hundred ninety-seven".