20502535545 has 24 divisors (see below), whose sum is σ = 35645118912. Its totient is φ = 10901642400.

The previous prime is 20502535519. The next prime is 20502535591. The reversal of 20502535545 is 54553520502.

20502535545 is a `hidden beast` number, since 2 + 0 + 50 + 2 + 53 + 554 + 5 = 666.

It is not a de Polignac number, because 20502535545 - 2⁹ = 20502535033 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 673341 + ... + 703130.

It is an arithmetic number, because the mean of its divisors is an integer number (1485213288).

Almost surely, 2^20502535545 is an apocalyptic number.

It is an amenable number.

20502535545 is a deficient number, since it is larger than the sum of its proper divisors (15142583367).

20502535545 is a wasteful number, since it uses less digits than its factorization.

20502535545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1376813 (or 1376810 counting only the distinct ones).

The product of its (nonzero) digits is 150000, while the sum is 36.

The spelling of 20502535545 in words is "twenty billion, five hundred two million, five hundred thirty-five thousand, five hundred forty-five".