20115198 has 24 divisors (see below), whose sum is σ = 44762328. Its totient is φ = 6523632.

The previous prime is 20115197. The next prime is 20115211. The reversal of 20115198 is 89151102.

It is a Curzon 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 pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14436 + ... + 15767.

It is an arithmetic number, because the mean of its divisors is an integer number (1865097).

Almost surely, 2^20115198 is an apocalyptic number.

20115198 is an abundant number, since it is smaller than the sum of its proper divisors (24647130).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20115198 is a wasteful number, since it uses less digits than its factorization.

20115198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30248 (or 30245 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 27.

The square root of 20115198 is about 4484.9969899655. The cubic root of 20115198 is about 271.9619233753.

Adding to 20115198 its sum of digits (27), we get a square (20115225 = 4485²).

The spelling of 20115198 in words is "twenty million, one hundred fifteen thousand, one hundred ninety-eight".