20520402322143 has 4 divisors (see below), whose sum is σ = 27360536429528. Its totient is φ = 13680268214760.

The previous prime is 20520402322081. The next prime is 20520402322159. The reversal of 20520402322143 is 34122320402502.

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

It is not a de Polignac number, because 20520402322143 - 2¹² = 20520402318047 is a prime.

It is a super-2 number, since 2×20520402322143² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20520402322143.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20520402322943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3420067053688 + ... + 3420067053693.

It is an arithmetic number, because the mean of its divisors is an integer number (6840134107382).

Almost surely, 2^{20520402322143} is an apocalyptic number.

20520402322143 is a deficient number, since it is larger than the sum of its proper divisors (6840134107385).

20520402322143 is an equidigital number, since it uses as much as digits as its factorization.

20520402322143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6840134107384.

The product of its (nonzero) digits is 23040, while the sum is 30.

Adding to 20520402322143 its reverse (34122320402502), we get a palindrome (54642722724645).

The spelling of 20520402322143 in words is "twenty trillion, five hundred twenty billion, four hundred two million, three hundred twenty-two thousand, one hundred forty-three".