20535332143 has 4 divisors (see below), whose sum is σ = 20883388680. Its totient is φ = 20187275608.

The previous prime is 20535332137. The next prime is 20535332197. The reversal of 20535332143 is 34123353502.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20535332143 - 2²¹ = 20533234991 is a prime.

It is a super-3 number, since 3×20535332143³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20535332123) 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 3 ways as a sum of consecutive naturals, for example, 174028180 + ... + 174028297.

It is an arithmetic number, because the mean of its divisors is an integer number (5220847170).

Almost surely, 2^20535332143 is an apocalyptic number.

20535332143 is a deficient number, since it is larger than the sum of its proper divisors (348056537).

20535332143 is an equidigital number, since it uses as much as digits as its factorization.

20535332143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 348056536.

The product of its (nonzero) digits is 32400, while the sum is 31.

Adding to 20535332143 its reverse (34123353502), we get a palindrome (54658685645).

The spelling of 20535332143 in words is "twenty billion, five hundred thirty-five million, three hundred thirty-two thousand, one hundred forty-three".