20905571199 has 8 divisors (see below), whose sum is σ = 29341152640. Its totient is φ = 13203518616.

The previous prime is 20905571191. The next prime is 20905571201. The reversal of 20905571199 is 99117550902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20905571199 - 2³ = 20905571191 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20905571191) 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, 183382147 + ... + 183382260.

It is an arithmetic number, because the mean of its divisors is an integer number (3667644080).

Almost surely, 2^20905571199 is an apocalyptic number.

20905571199 is a deficient number, since it is larger than the sum of its proper divisors (8435581441).

20905571199 is a wasteful number, since it uses less digits than its factorization.

20905571199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 366764429.

The product of its (nonzero) digits is 255150, while the sum is 48.

The spelling of 20905571199 in words is "twenty billion, nine hundred five million, five hundred seventy-one thousand, one hundred ninety-nine".