20393911 has 8 divisors (see below), whose sum is σ = 21314304. Its totient is φ = 19493880.

The previous prime is 20393861. The next prime is 20393917. The reversal of 20393911 is 11939302.

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 20393911 - 2¹³ = 20385719 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 20393911.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20393917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3025 + ... + 7066.

It is an arithmetic number, because the mean of its divisors is an integer number (2664288).

Almost surely, 2^20393911 is an apocalyptic number.

20393911 is a deficient number, since it is larger than the sum of its proper divisors (920393).

20393911 is a wasteful number, since it uses less digits than its factorization.

20393911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10181.

The product of its (nonzero) digits is 1458, while the sum is 28.

The square root of 20393911 is about 4515.9618023185. The cubic root of 20393911 is about 273.2122533657.

The spelling of 20393911 in words is "twenty million, three hundred ninety-three thousand, nine hundred eleven".