20338405 has 8 divisors (see below), whose sum is σ = 24593184. Its totient is φ = 16146000.

The previous prime is 20338393. The next prime is 20338433. The reversal of 20338405 is 50483302.

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

It is not a de Polignac number, because 20338405 - 2¹¹ = 20336357 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20338405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14871 + ... + 16180.

It is an arithmetic number, because the mean of its divisors is an integer number (3074148).

Almost surely, 2^20338405 is an apocalyptic number.

It is an amenable number.

20338405 is a deficient number, since it is larger than the sum of its proper divisors (4254779).

20338405 is a wasteful number, since it uses less digits than its factorization.

20338405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31187.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 20338405 is about 4509.8120803422. The cubic root of 20338405 is about 272.9641613695.

The spelling of 20338405 in words is "twenty million, three hundred thirty-eight thousand, four hundred five".