20504928 has 48 divisors (see below), whose sum is σ = 54190080. Its totient is φ = 6788736.

The previous prime is 20504923. The next prime is 20504959. The reversal of 20504928 is 82940502.

It is a tau number, because it is divible by the number of its divisors (48).

It is a junction number, because it is equal to n+sod(n) for n = 20504895 and 20504904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20504921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15393 + ... + 16671.

It is an arithmetic number, because the mean of its divisors is an integer number (1128960).

Almost surely, 2^20504928 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 20504928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27095040).

20504928 is an abundant number, since it is smaller than the sum of its proper divisors (33685152).

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

20504928 is a wasteful number, since it uses less digits than its factorization.

20504928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1459 (or 1451 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 20504928 is about 4528.2367429276. The cubic root of 20504928 is about 273.7071123989.

The spelling of 20504928 in words is "twenty million, five hundred four thousand, nine hundred twenty-eight".