20887538111 has 8 divisors (see below), whose sum is σ = 22873048704. Its totient is φ = 18916468120.

The previous prime is 20887538093. The next prime is 20887538137. The reversal of 20887538111 is 11183578802.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20887538111 - 2⁶ = 20887538047 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20887538171) 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 7 ways as a sum of consecutive naturals, for example, 3607121 + ... + 3612906.

It is an arithmetic number, because the mean of its divisors is an integer number (2859131088).

Almost surely, 2^20887538111 is an apocalyptic number.

20887538111 is a deficient number, since it is larger than the sum of its proper divisors (1985510593).

20887538111 is a wasteful number, since it uses less digits than its factorization.

20887538111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7220301.

The product of its (nonzero) digits is 107520, while the sum is 44.

The spelling of 20887538111 in words is "twenty billion, eight hundred eighty-seven million, five hundred thirty-eight thousand, one hundred eleven".