20515542132503 has 32 divisors (see below), whose sum is σ = 22755156145920. Its totient is φ = 18340971989760.

The previous prime is 20515542132499. The next prime is 20515542132563. The reversal of 20515542132503 is 30523124551502.

It is a cyclic number.

It is not a de Polignac number, because 20515542132503 - 2² = 20515542132499 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20515542132563) 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 31 ways as a sum of consecutive naturals, for example, 1248883376 + ... + 1248899802.

It is an arithmetic number, because the mean of its divisors is an integer number (711098629560).

Almost surely, 2^{20515542132503} is an apocalyptic number.

20515542132503 is a deficient number, since it is larger than the sum of its proper divisors (2239614013417).

20515542132503 is a wasteful number, since it uses less digits than its factorization.

20515542132503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24287.

The product of its (nonzero) digits is 180000, while the sum is 38.

The spelling of 20515542132503 in words is "twenty trillion, five hundred fifteen billion, five hundred forty-two million, one hundred thirty-two thousand, five hundred three".