20389197 has 8 divisors (see below), whose sum is σ = 27349056. Its totient is φ = 13511072.

The previous prime is 20389169. The next prime is 20389207. The reversal of 20389197 is 79198302.

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 20389197 - 2¹⁶ = 20323661 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20389157) 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, 19848 + ... + 20849.

It is an arithmetic number, because the mean of its divisors is an integer number (3418632).

Almost surely, 2^20389197 is an apocalyptic number.

It is an amenable number.

20389197 is a deficient number, since it is larger than the sum of its proper divisors (6959859).

20389197 is a wasteful number, since it uses less digits than its factorization.

20389197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40867.

The product of its (nonzero) digits is 27216, while the sum is 39.

The square root of 20389197 is about 4515.4398456850. The cubic root of 20389197 is about 273.1912009739.

The spelling of 20389197 in words is "twenty million, three hundred eighty-nine thousand, one hundred ninety-seven".