20887864365 has 16 divisors (see below), whose sum is σ = 34573017600. Its totient is φ = 10756049472.

The previous prime is 20887864363. The next prime is 20887864367. The reversal of 20887864365 is 56346878802.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20887864363) and next prime (20887864367).

It is not a de Polignac number, because 20887864365 - 2¹ = 20887864363 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20887864363) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24008605 + ... + 24009474.

It is an arithmetic number, because the mean of its divisors is an integer number (2160813600).

Almost surely, 2^20887864365 is an apocalyptic number.

It is an amenable number.

20887864365 is a deficient number, since it is larger than the sum of its proper divisors (13685153235).

20887864365 is a wasteful number, since it uses less digits than its factorization.

20887864365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48018116.

The product of its (nonzero) digits is 15482880, while the sum is 57.

The spelling of 20887864365 in words is "twenty billion, eight hundred eighty-seven million, eight hundred sixty-four thousand, three hundred sixty-five".