20536192091538 has 42 divisors (see below), whose sum is σ = 46185693594597. Its totient is φ = 6845339684880.

The previous prime is 20536192091537. The next prime is 20536192091561. The reversal of 20536192091538 is 83519029163502.

20536192091538 is a `hidden beast` number, since 2 + 0 + 5 + 3 + 6 + 19 + 2 + 0 + 91 + 538 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 17152494384249 + 3383697707289 = 4141557^2 + 1839483^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=3204387.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (20536192091537) 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 20 ways as a sum of consecutive naturals, for example, 172977558 + ... + 173096238.

Almost surely, 2^{20536192091538} is an apocalyptic number.

20536192091538 is an abundant number, since it is smaller than the sum of its proper divisors (25649501503059).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20536192091538 is an frugal number, since it uses more digits than its factorization.

20536192091538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237382 (or 118686 counting only the distinct ones).

The product of its (nonzero) digits is 3499200, while the sum is 54.

The spelling of 20536192091538 in words is "twenty trillion, five hundred thirty-six billion, one hundred ninety-two million, ninety-one thousand, five hundred thirty-eight".