20887006148138 has 16 divisors (see below), whose sum is σ = 33790386750120. Its totient is φ = 9625917153216.

The previous prime is 20887006148131. The next prime is 20887006148167. The reversal of 20887006148138 is 83184160078802.

It can be written as a sum of positive squares in 4 ways, for example, as 18021952281529 + 2865053866609 = 4245227^2 + 1692647^2 .

It is a super-2 number, since 2×20887006148138² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20887006148131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 593295833 + ... + 593331036.

Almost surely, 2^{20887006148138} is an apocalyptic number.

20887006148138 is a deficient number, since it is larger than the sum of its proper divisors (12903380601982).

20887006148138 is a wasteful number, since it uses less digits than its factorization.

20887006148138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1186627561.

The product of its (nonzero) digits is 4128768, while the sum is 56.

The spelling of 20887006148138 in words is "twenty trillion, eight hundred eighty-seven billion, six million, one hundred forty-eight thousand, one hundred thirty-eight".