20043481 has 4 divisors (see below), whose sum is σ = 20052964. Its totient is φ = 20034000.

The previous prime is 20043469. The next prime is 20043559. The reversal of 20043481 is 18434002.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 18434002 = 2 ⋅9217001.

It can be written as a sum of positive squares in 2 ways, for example, as 6205081 + 13838400 = 2491^2 + 3720^2 .

It is a cyclic number.

It is not a de Polignac number, because 20043481 - 2¹¹ = 20041433 is a prime.

It is a super-2 number, since 2×20043481² = 803482261194722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20043451) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31 + ... + 6331.

It is an arithmetic number, because the mean of its divisors is an integer number (5013241).

Almost surely, 2^20043481 is an apocalyptic number.

20043481 is the 2832-nd centered pentagonal number.

It is an amenable number.

20043481 is a deficient number, since it is larger than the sum of its proper divisors (9483).

20043481 is an equidigital number, since it uses as much as digits as its factorization.

20043481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9482.

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 20043481 is about 4476.9946392642. The cubic root of 20043481 is about 271.6383286001.

Adding to 20043481 its reverse (18434002), we get a palindrome (38477483).

It can be divided in two parts, 200 and 43481, that added together give a square (43681 = 209²).

The spelling of 20043481 in words is "twenty million, forty-three thousand, four hundred eighty-one".