20043142561 has 8 divisors (see below), whose sum is σ = 21827451240. Its totient is φ = 18293480832.

The previous prime is 20043142547. The next prime is 20043142573. The reversal of 20043142561 is 16524134002.

It can be written as a sum of positive squares in 4 ways, for example, as 637259536 + 19405883025 = 25244^2 + 139305^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 20043142561 - 2¹⁷ = 20043011489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20043142501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8660530 + ... + 8662843.

It is an arithmetic number, because the mean of its divisors is an integer number (2728431405).

Almost surely, 2^20043142561 is an apocalyptic number.

It is an amenable number.

20043142561 is a deficient number, since it is larger than the sum of its proper divisors (1784308679).

20043142561 is a wasteful number, since it uses less digits than its factorization.

20043142561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17323475.

The product of its (nonzero) digits is 5760, while the sum is 28.

Adding to 20043142561 its reverse (16524134002), we get a palindrome (36567276563).

The spelling of 20043142561 in words is "twenty billion, forty-three million, one hundred forty-two thousand, five hundred sixty-one".