20243553 has 8 divisors (see below), whose sum is σ = 29445216. Its totient is φ = 12268800.

The previous prime is 20243533. The next prime is 20243563. The reversal of 20243553 is 35534202.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20243553 - 2¹⁶ = 20178017 is a prime.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (20243533) 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 7 ways as a sum of consecutive naturals, for example, 306688 + ... + 306753.

It is an arithmetic number, because the mean of its divisors is an integer number (3680652).

Almost surely, 2^20243553 is an apocalyptic number.

It is an amenable number.

20243553 is a deficient number, since it is larger than the sum of its proper divisors (9201663).

20243553 is a wasteful number, since it uses less digits than its factorization.

20243553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 613455.

The product of its (nonzero) digits is 3600, while the sum is 24.

The square root of 20243553 is about 4499.2836096428. The cubic root of 20243553 is about 272.5391599868.

Adding to 20243553 its reverse (35534202), we get a palindrome (55777755).

The spelling of 20243553 in words is "twenty million, two hundred forty-three thousand, five hundred fifty-three".