20099898 has 72 divisors (see below), whose sum is σ = 54587988. Its totient is φ = 5298048.

The previous prime is 20099867. The next prime is 20099903. The reversal of 20099898 is 89899002.

It can be written as a sum of positive squares in 2 ways, for example, as 15421329 + 4678569 = 3927^2 + 2163^2 .

It is a super-2 number, since 2×20099898² = 808011799220808, which contains 22 as substring.

It is an unprimeable number.

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 35 ways as a sum of consecutive naturals, for example, 10590 + ... + 12342.

Almost surely, 2^20099898 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20099898, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27293994).

20099898 is an abundant number, since it is smaller than the sum of its proper divisors (34488090).

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

20099898 is a wasteful number, since it uses less digits than its factorization.

20099898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1788 (or 1778 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 45.

The square root of 20099898 is about 4483.2909787343. The cubic root of 20099898 is about 271.8929527582.

The spelling of 20099898 in words is "twenty million, ninety-nine thousand, eight hundred ninety-eight".