20499199 has 6 divisors (see below), whose sum is σ = 23846064. Its totient is φ = 17570700.

The previous prime is 20499179. The next prime is 20499209. The reversal of 20499199 is 99199402.

It is not a de Polignac number, because 20499199 - 2⁷ = 20499071 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 (20499169) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 209127 + ... + 209224.

It is an arithmetic number, because the mean of its divisors is an integer number (3974344).

Almost surely, 2^20499199 is an apocalyptic number.

20499199 is a deficient number, since it is larger than the sum of its proper divisors (3346865).

20499199 is an equidigital number, since it uses as much as digits as its factorization.

20499199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 418365 (or 418358 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 43.

The square root of 20499199 is about 4527.6041125522. The cubic root of 20499199 is about 273.6816191109.

The spelling of 20499199 in words is "twenty million, four hundred ninety-nine thousand, one hundred ninety-nine".