20382409 has 4 divisors (see below), whose sum is σ = 20396304. Its totient is φ = 20368516.

The previous prime is 20382391. The next prime is 20382419. The reversal of 20382409 is 90428302.

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 20382409 - 2¹⁹ = 19858121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20382419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4447 + ... + 7780.

It is an arithmetic number, because the mean of its divisors is an integer number (5099076).

Almost surely, 2^20382409 is an apocalyptic number.

It is an amenable number.

20382409 is a deficient number, since it is larger than the sum of its proper divisors (13895).

20382409 is a wasteful number, since it uses less digits than its factorization.

20382409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13894.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 20382409 is about 4514.6881398387. The cubic root of 20382409 is about 273.1608805433.

The spelling of 20382409 in words is "twenty million, three hundred eighty-two thousand, four hundred nine".