20389109 has 32 divisors (see below), whose sum is σ = 25025280. Its totient is φ = 16422912.

The previous prime is 20389097. The next prime is 20389111. The reversal of 20389109 is 90198302.

20389109 = T₇₃₄ + T₇₃₅ + ... + T₈₀₂.

It is a cyclic number.

It is not a de Polignac number, because 20389109 - 2⁴ = 20389093 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20389129) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 210149 + ... + 210245.

It is an arithmetic number, because the mean of its divisors is an integer number (782040).

Almost surely, 2^20389109 is an apocalyptic number.

It is an amenable number.

20389109 is a deficient number, since it is larger than the sum of its proper divisors (4636171).

20389109 is a wasteful number, since it uses less digits than its factorization.

20389109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 20389109 is about 4515.4301013303. The cubic root of 20389109 is about 273.1908079413.

The spelling of 20389109 in words is "twenty million, three hundred eighty-nine thousand, one hundred nine".