20504500136 has 8 divisors (see below), whose sum is σ = 38445937770. Its totient is φ = 10252250064.

The previous prime is 20504500067. The next prime is 20504500147. The reversal of 20504500136 is 63100540502.

It can be written as a sum of positive squares in only one way, i.e., 17851632100 + 2652868036 = 133610^2 + 51506^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1281531251 + ... + 1281531266.

Almost surely, 2^20504500136 is an apocalyptic number.

It is an amenable number.

20504500136 is a deficient number, since it is larger than the sum of its proper divisors (17941437634).

20504500136 is a wasteful number, since it uses less digits than its factorization.

20504500136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2563062523 (or 2563062519 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 26.

The spelling of 20504500136 in words is "twenty billion, five hundred four million, five hundred thousand, one hundred thirty-six".