20542136536 has 16 divisors (see below), whose sum is σ = 38548972440. Its totient is φ = 10262410560.

The previous prime is 20542136513. The next prime is 20542136567. The reversal of 20542136536 is 63563124502.

It is a junction number, because it is equal to n+sod(n) for n = 20542136495 and 20542136504.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1072125 + ... + 1091116.

Almost surely, 2^20542136536 is an apocalyptic number.

It is an amenable number.

20542136536 is a deficient number, since it is larger than the sum of its proper divisors (18006835904).

20542136536 is a wasteful number, since it uses less digits than its factorization.

20542136536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2164434 (or 2164430 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 37.

The spelling of 20542136536 in words is "twenty billion, five hundred forty-two million, one hundred thirty-six thousand, five hundred thirty-six".