20520105020141 has 4 divisors (see below), whose sum is σ = 20520136785372. Its totient is φ = 20520073254912.

The previous prime is 20520105020137. The next prime is 20520105020143. The reversal of 20520105020141 is 14102050102502.

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

It can be written as a sum of positive squares in 2 ways, for example, as 11205120234025 + 9314984786116 = 3347405^2 + 3052046^2 .

It is a cyclic number.

It is not a de Polignac number, because 20520105020141 - 2² = 20520105020137 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20520105020143) 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, 14893076 + ... + 16212461.

It is an arithmetic number, because the mean of its divisors is an integer number (5130034196343).

Almost surely, 2^{20520105020141} is an apocalyptic number.

It is an amenable number.

20520105020141 is a deficient number, since it is larger than the sum of its proper divisors (31765231).

20520105020141 is an equidigital number, since it uses as much as digits as its factorization.

20520105020141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31765230.

The product of its (nonzero) digits is 800, while the sum is 23.

Adding to 20520105020141 its reverse (14102050102502), we get a palindrome (34622155122643).

The spelling of 20520105020141 in words is "twenty trillion, five hundred twenty billion, one hundred five million, twenty thousand, one hundred forty-one".