20898171844 has 27 divisors (see below), whose sum is σ = 40204874703. Its totient is φ = 9497723400.

The previous prime is 20898171829. The next prime is 20898171851. The reversal of 20898171844 is 44817189802.

The square root of 20898171844 is 144562.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20898171791 and 20898171800.

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 8 ways as a sum of consecutive naturals, for example, 3177079 + ... + 3183649.

Almost surely, 2^20898171844 is an apocalyptic number.

20898171844 is the 144562-nd square number.

It is an amenable number.

20898171844 is a deficient number, since it is larger than the sum of its proper divisors (19306702859).

20898171844 is an frugal number, since it uses more digits than its factorization.

20898171844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13168 (or 6584 counting only the distinct ones).

The product of its (nonzero) digits is 1032192, while the sum is 52.

The spelling of 20898171844 in words is "twenty billion, eight hundred ninety-eight million, one hundred seventy-one thousand, eight hundred forty-four".