20998128 has 40 divisors (see below), whose sum is σ = 57438288. Its totient is φ = 6587392.

The previous prime is 20998093. The next prime is 20998139. The reversal of 20998128 is 82189902.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12051 + ... + 13682.

Almost surely, 2^20998128 is an apocalyptic number.

It is an amenable number.

20998128 is an abundant number, since it is smaller than the sum of its proper divisors (36440160).

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

20998128 is a wasteful number, since it uses less digits than its factorization.

20998128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25761 (or 25755 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 39.

The square root of 20998128 is about 4582.3714384585. The cubic root of 20998128 is about 275.8842194484.

The spelling of 20998128 in words is "twenty million, nine hundred ninety-eight thousand, one hundred twenty-eight".