20905590199 has 32 divisors (see below), whose sum is σ = 23994774720. Its totient is φ = 18054586368.

The previous prime is 20905590193. The next prime is 20905590203. The reversal of 20905590199 is 99109550902.

It is a happy number.

It is not a de Polignac number, because 20905590199 - 2⁷ = 20905590071 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20905590193) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8734947 + ... + 8737339.

It is an arithmetic number, because the mean of its divisors is an integer number (749836710).

Almost surely, 2^20905590199 is an apocalyptic number.

20905590199 is a deficient number, since it is larger than the sum of its proper divisors (3089184521).

20905590199 is a wasteful number, since it uses less digits than its factorization.

20905590199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2851.

The product of its (nonzero) digits is 328050, while the sum is 49.

The spelling of 20905590199 in words is "twenty billion, nine hundred five million, five hundred ninety thousand, one hundred ninety-nine".