20998125 has 30 divisors (see below), whose sum is σ = 37911302. Its totient is φ = 11196000.

The previous prime is 20998093. The next prime is 20998139. The reversal of 20998125 is 52189902.

It can be written as a sum of positive squares in 5 ways, for example, as 7733961 + 13264164 = 2781^2 + 3642^2 .

It is not a de Polignac number, because 20998125 - 2⁵ = 20998093 is a prime.

It is a super-3 number, since 3×20998125³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20998125.

It is a congruent number.

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 29 ways as a sum of consecutive naturals, for example, 3759 + ... + 7491.

Almost surely, 2^20998125 is an apocalyptic number.

20998125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20998125 is a deficient number, since it is larger than the sum of its proper divisors (16913177).

20998125 is an equidigital number, since it uses as much as digits as its factorization.

20998125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3759 (or 3741 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 20998125 is about 4582.3711111170. The cubic root of 20998125 is about 275.8842063099.

The spelling of 20998125 in words is "twenty million, nine hundred ninety-eight thousand, one hundred twenty-five".