20998570519 has 4 divisors (see below), whose sum is σ = 21000163720. Its totient is φ = 20996977320.

The previous prime is 20998570517. The next prime is 20998570543. The reversal of 20998570519 is 91507589902.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20998570519 - 2¹ = 20998570517 is a prime.

It is a super-2 number, since 2×20998570519² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20998570519.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20998570513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 776664 + ... + 803245.

It is an arithmetic number, because the mean of its divisors is an integer number (5250040930).

Almost surely, 2^20998570519 is an apocalyptic number.

20998570519 is a deficient number, since it is larger than the sum of its proper divisors (1593201).

20998570519 is a wasteful number, since it uses less digits than its factorization.

20998570519 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1593200.

The product of its (nonzero) digits is 2041200, while the sum is 55.

The spelling of 20998570519 in words is "twenty billion, nine hundred ninety-eight million, five hundred seventy thousand, five hundred nineteen".