20998648 has 48 divisors (see below), whose sum is σ = 45399960. Its totient is φ = 9028800.

The previous prime is 20998633. The next prime is 20998673. The reversal of 20998648 is 84689902.

It is a junction number, because it is equal to n+sod(n) for n = 20998598 and 20998607.

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 11 ways as a sum of consecutive naturals, for example, 31438 + ... + 32098.

Almost surely, 2^20998648 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20998648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22699980).

20998648 is an abundant number, since it is smaller than the sum of its proper divisors (24401312).

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

20998648 is a wasteful number, since it uses less digits than its factorization.

20998648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 716 (or 693 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 46.

The square root of 20998648 is about 4582.4281772877. The cubic root of 20998648 is about 275.8864967722.

The spelling of 20998648 in words is "twenty million, nine hundred ninety-eight thousand, six hundred forty-eight".