20380399 has 8 divisors (see below), whose sum is σ = 23239440. Its totient is φ = 17705856.

The previous prime is 20380343. The next prime is 20380427. The reversal of 20380399 is 99308302.

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 20380399 - 2⁷ = 20380271 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 (20380309) 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, 45889 + ... + 46330.

It is an arithmetic number, because the mean of its divisors is an integer number (2904930).

Almost surely, 2^20380399 is an apocalyptic number.

20380399 is a deficient number, since it is larger than the sum of its proper divisors (2859041).

20380399 is a wasteful number, since it uses less digits than its factorization.

20380399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92249.

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 20380399 is about 4514.4655276123. The cubic root of 20380399 is about 273.1519010450.

The spelling of 20380399 in words is "twenty million, three hundred eighty thousand, three hundred ninety-nine".