20513809199 has 16 divisors (see below), whose sum is σ = 22872870720. Its totient is φ = 18267432960.

The previous prime is 20513809177. The next prime is 20513809207. The reversal of 20513809199 is 99190831502.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20513809199 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20513809139) 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, 436454 + ... + 481164.

It is an arithmetic number, because the mean of its divisors is an integer number (1429554420).

Almost surely, 2^20513809199 is an apocalyptic number.

20513809199 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

20513809199 is a deficient number, since it is larger than the sum of its proper divisors (2359061521).

20513809199 is a wasteful number, since it uses less digits than its factorization.

20513809199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45970.

The product of its (nonzero) digits is 174960, while the sum is 47.

The spelling of 20513809199 in words is "twenty billion, five hundred thirteen million, eight hundred nine thousand, one hundred ninety-nine".