20513540415355 has 8 divisors (see below), whose sum is σ = 26509806075312. Its totient is φ = 15148460614368.

The previous prime is 20513540415341. The next prime is 20513540415391. The reversal of 20513540415355 is 55351404531502.

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 20513540415355 - 2³⁷ = 20376101461883 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 157796464669 + ... + 157796464798.

It is an arithmetic number, because the mean of its divisors is an integer number (3313725759414).

Almost surely, 2^{20513540415355} is an apocalyptic number.

20513540415355 is a deficient number, since it is larger than the sum of its proper divisors (5996265659957).

20513540415355 is a wasteful number, since it uses less digits than its factorization.

20513540415355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315592929485.

The product of its (nonzero) digits is 900000, while the sum is 43.

Adding to 20513540415355 its reverse (55351404531502), we get a palindrome (75864944946857).

The spelling of 20513540415355 in words is "twenty trillion, five hundred thirteen billion, five hundred forty million, four hundred fifteen thousand, three hundred fifty-five".