20355393 has 16 divisors (see below), whose sum is σ = 28195776. Its totient is φ = 13052160.

The previous prime is 20355373. The next prime is 20355431. The reversal of 20355393 is 39355302.

It is not a de Polignac number, because 20355393 - 2⁹ = 20354881 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20355393.

It is not an unprimeable number, because it can be changed into a prime (20355373) 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 15 ways as a sum of consecutive naturals, for example, 7846 + ... + 10112.

It is an arithmetic number, because the mean of its divisors is an integer number (1762236).

Almost surely, 2^20355393 is an apocalyptic number.

It is an amenable number.

20355393 is a deficient number, since it is larger than the sum of its proper divisors (7840383).

20355393 is a wasteful number, since it uses less digits than its factorization.

20355393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2384.

The product of its (nonzero) digits is 12150, while the sum is 30.

The square root of 20355393 is about 4511.6951359772. The cubic root of 20355393 is about 273.0401395447.

The spelling of 20355393 in words is "twenty million, three hundred fifty-five thousand, three hundred ninety-three".