20355844 has 12 divisors (see below), whose sum is σ = 36491868. Its totient is φ = 9929600.

The previous prime is 20355827. The next prime is 20355847. The reversal of 20355844 is 44855302.

It can be written as a sum of positive squares in 2 ways, for example, as 4674244 + 15681600 = 2162^2 + 3960^2 .

It is not an unprimeable number, because it can be changed into a prime (20355847) 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 3 ways as a sum of consecutive naturals, for example, 61897 + ... + 62224.

It is an arithmetic number, because the mean of its divisors is an integer number (3040989).

Almost surely, 2^20355844 is an apocalyptic number.

It is an amenable number.

20355844 is a deficient number, since it is larger than the sum of its proper divisors (16136024).

20355844 is a wasteful number, since it uses less digits than its factorization.

20355844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124166 (or 124164 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 31.

The square root of 20355844 is about 4511.7451169143. The cubic root of 20355844 is about 273.0421560487.

The spelling of 20355844 in words is "twenty million, three hundred fifty-five thousand, eight hundred forty-four".