20172449898 has 16 divisors (see below), whose sum is σ = 44827666560. Its totient is φ = 6724149948.

The previous prime is 20172449879. The next prime is 20172449953. The reversal of 20172449898 is 89894427102.

20172449898 is a `hidden beast` number, since 20 + 172 + 449 + 8 + 9 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54), and also a Moran number because the ratio is a prime number: 373563887 = 20172449898 / (2 + 0 + 1 + 7 + 2 + 4 + 4 + 9 + 8 + 9 + 8).

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 186781890 + ... + 186781997.

It is an arithmetic number, because the mean of its divisors is an integer number (2801729160).

Almost surely, 2^20172449898 is an apocalyptic number.

20172449898 is an abundant number, since it is smaller than the sum of its proper divisors (24655216662).

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

20172449898 is a wasteful number, since it uses less digits than its factorization.

20172449898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 373563898 (or 373563892 counting only the distinct ones).

The product of its (nonzero) digits is 2322432, while the sum is 54.

The spelling of 20172449898 in words is "twenty billion, one hundred seventy-two million, four hundred forty-nine thousand, eight hundred ninety-eight".