20380109 has 4 divisors (see below), whose sum is σ = 20392704. Its totient is φ = 20367516.

The previous prime is 20380097. The next prime is 20380111. The reversal of 20380109 is 90108302.

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 20380109 - 2¹⁶ = 20314573 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20380169) 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, 3437 + ... + 7250.

It is an arithmetic number, because the mean of its divisors is an integer number (5098176).

Almost surely, 2^20380109 is an apocalyptic number.

It is an amenable number.

20380109 is a deficient number, since it is larger than the sum of its proper divisors (12595).

20380109 is a wasteful number, since it uses less digits than its factorization.

20380109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12594.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 20380109 is about 4514.4334085243. The cubic root of 20380109 is about 273.1506054468.

The spelling of 20380109 in words is "twenty million, three hundred eighty thousand, one hundred nine".