20494928 has 40 divisors (see below), whose sum is σ = 42408000. Its totient is φ = 9561600.

The previous prime is 20494907. The next prime is 20494987. The reversal of 20494928 is 82949402.

It is a junction number, because it is equal to n+sod(n) for n = 20494891 and 20494900.

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, 40823 + ... + 41321.

It is an arithmetic number, because the mean of its divisors is an integer number (1060200).

Almost surely, 2^20494928 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 20494928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21204000).

20494928 is an abundant number, since it is smaller than the sum of its proper divisors (21913072).

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

20494928 is a wasteful number, since it uses less digits than its factorization.

20494928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 675 (or 669 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 20494928 is about 4527.1324257194. The cubic root of 20494928 is about 273.6626106383.

The spelling of 20494928 in words is "twenty million, four hundred ninety-four thousand, nine hundred twenty-eight".