20043555 has 16 divisors (see below), whose sum is σ = 36651264. Its totient is φ = 9162720.

The previous prime is 20043469. The next prime is 20043559. The reversal of 20043555 is 55534002.

It is not a de Polignac number, because 20043555 - 2¹¹ = 20041507 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20043559) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 95341 + ... + 95550.

It is an arithmetic number, because the mean of its divisors is an integer number (2290704).

Almost surely, 2^20043555 is an apocalyptic number.

20043555 is a deficient number, since it is larger than the sum of its proper divisors (16607709).

20043555 is a wasteful number, since it uses less digits than its factorization.

20043555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190906.

The product of its (nonzero) digits is 3000, while the sum is 24.

The square root of 20043555 is about 4477.0029037292. The cubic root of 20043555 is about 271.6386628935.

Adding to 20043555 its reverse (55534002), we get a palindrome (75577557).

The spelling of 20043555 in words is "twenty million, forty-three thousand, five hundred fifty-five".