20384391 has 8 divisors (see below), whose sum is σ = 28056064. Its totient is φ = 13151160.

The previous prime is 20384387. The next prime is 20384407. The reversal of 20384391 is 19348302.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20384391 - 2² = 20384387 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 (20384381) 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, 109501 + ... + 109686.

It is an arithmetic number, because the mean of its divisors is an integer number (3507008).

Almost surely, 2^20384391 is an apocalyptic number.

20384391 is a deficient number, since it is larger than the sum of its proper divisors (7671673).

20384391 is a wasteful number, since it uses less digits than its factorization.

20384391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219221.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 20384391 is about 4514.9076402513. The cubic root of 20384391 is about 273.1697343760.

The spelling of 20384391 in words is "twenty million, three hundred eighty-four thousand, three hundred ninety-one".