20511300413413 has 4 divisors (see below), whose sum is σ = 20511309921228. Its totient is φ = 20511290905600.

The previous prime is 20511300413393. The next prime is 20511300413423. The reversal of 20511300413413 is 31431400311502.

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.

It can be written as a sum of positive squares in 2 ways, for example, as 9951614725924 + 10559685687489 = 3154618^2 + 3249567^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20511300413413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20511300413423) 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, 209295 + ... + 6408307.

It is an arithmetic number, because the mean of its divisors is an integer number (5127827480307).

Almost surely, 2^{20511300413413} is an apocalyptic number.

It is an amenable number.

20511300413413 is a deficient number, since it is larger than the sum of its proper divisors (9507815).

20511300413413 is an equidigital number, since it uses as much as digits as its factorization.

20511300413413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9507814.

The product of its (nonzero) digits is 4320, while the sum is 28.

Adding to 20511300413413 its reverse (31431400311502), we get a palindrome (51942700724915).

The spelling of 20511300413413 in words is "twenty trillion, five hundred eleven billion, three hundred million, four hundred thirteen thousand, four hundred thirteen".