20864878519 has 16 divisors (see below), whose sum is σ = 22487731200. Its totient is φ = 19295067456.

The previous prime is 20864878511. The next prime is 20864878537. The reversal of 20864878519 is 91587846802.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20864878519 - 2³ = 20864878511 is a prime.

It is a super-2 number, since 2×20864878519² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20864878511) 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, 1482387 + ... + 1496395.

It is an arithmetic number, because the mean of its divisors is an integer number (1405483200).

Almost surely, 2^20864878519 is an apocalyptic number.

20864878519 is a deficient number, since it is larger than the sum of its proper divisors (1622852681).

20864878519 is a wasteful number, since it uses less digits than its factorization.

20864878519 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15894.

The product of its (nonzero) digits is 7741440, while the sum is 58.

The spelling of 20864878519 in words is "twenty billion, eight hundred sixty-four million, eight hundred seventy-eight thousand, five hundred nineteen".