20119999 has 4 divisors (see below), whose sum is σ = 20131336. Its totient is φ = 20108664.

The previous prime is 20119991. The next prime is 20120029. The reversal of 20119999 is 99991102.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20119999 - 2³ = 20119991 is a prime.

It is a Duffinian number.

20119999 is a modest number, since divided by 9999 gives 2011 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20119991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2364 + ... + 6769.

It is an arithmetic number, because the mean of its divisors is an integer number (5032834).

Almost surely, 2^20119999 is an apocalyptic number.

20119999 is a deficient number, since it is larger than the sum of its proper divisors (11337).

20119999 is an equidigital number, since it uses as much as digits as its factorization.

20119999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11336.

The product of its (nonzero) digits is 13122, while the sum is 40.

The square root of 20119999 is about 4485.5321869317. The cubic root of 20119999 is about 271.9835585145.

The spelling of 20119999 in words is "twenty million, one hundred nineteen thousand, nine hundred ninety-nine".