20539401725187 has 24 divisors (see below), whose sum is σ = 30691329879600. Its totient is φ = 13220648094528.

The previous prime is 20539401725159. The next prime is 20539401725197. The reversal of 20539401725187 is 78152710493502.

20539401725187 is a `hidden beast` number, since 2 + 0 + 5 + 39 + 401 + 7 + 25 + 187 = 666.

It is not a de Polignac number, because 20539401725187 - 2³⁸ = 20264523818243 is a prime.

It is a super-2 number, since 2×20539401725187² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20539401725147) 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 23 ways as a sum of consecutive naturals, for example, 37181668 + ... + 37730030.

It is an arithmetic number, because the mean of its divisors is an integer number (1278805411650).

Almost surely, 2^{20539401725187} is an apocalyptic number.

20539401725187 is a deficient number, since it is larger than the sum of its proper divisors (10151928154413).

20539401725187 is a wasteful number, since it uses less digits than its factorization.

20539401725187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 691907 (or 691904 counting only the distinct ones).

The product of its (nonzero) digits is 4233600, while the sum is 54.

The spelling of 20539401725187 in words is "twenty trillion, five hundred thirty-nine billion, four hundred one million, seven hundred twenty-five thousand, one hundred eighty-seven".