20115199 has 8 divisors (see below), whose sum is σ = 22937040. Its totient is φ = 17475456.

The previous prime is 20115197. The next prime is 20115211. The reversal of 20115199 is 99151102.

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

It is not a de Polignac number, because 20115199 - 2¹ = 20115197 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 (20115191) 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, 45289 + ... + 45730.

It is an arithmetic number, because the mean of its divisors is an integer number (2867130).

Almost surely, 2^20115199 is an apocalyptic number.

20115199 is a deficient number, since it is larger than the sum of its proper divisors (2821841).

20115199 is a wasteful number, since it uses less digits than its factorization.

20115199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91049.

The product of its (nonzero) digits is 810, while the sum is 28.

The square root of 20115199 is about 4484.9971014483. The cubic root of 20115199 is about 271.9619278820.

It can be divided in two parts, 201 and 15199, that added together give a triangular number (15400 = T₁₇₅).

The spelling of 20115199 in words is "twenty million, one hundred fifteen thousand, one hundred ninety-nine".