20394255 has 32 divisors (see below), whose sum is σ = 38168064. Its totient is φ = 9104256.

The previous prime is 20394233. The next prime is 20394263. The reversal of 20394255 is 55249302.

It is a Cunningham number, because it is equal to 4516²-1.

It is not a de Polignac number, because 20394255 - 2⁹ = 20393743 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2257 + ... + 6773.

It is an arithmetic number, because the mean of its divisors is an integer number (1192752).

Almost surely, 2^20394255 is an apocalyptic number.

20394255 is a deficient number, since it is larger than the sum of its proper divisors (17773809).

20394255 is a wasteful number, since it uses less digits than its factorization.

20394255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4575.

The product of its (nonzero) digits is 10800, while the sum is 30.

The square root of 20394255 is about 4515.9998892825. Note that the first 3 decimals coincide. The cubic root of 20394255 is about 273.2137895184.

The spelling of 20394255 in words is "twenty million, three hundred ninety-four thousand, two hundred fifty-five".