20775648 has 48 divisors (see below), whose sum is σ = 56019600. Its totient is φ = 6736896.

The previous prime is 20775631. The next prime is 20775661. The reversal of 20775648 is 84657702.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 628 + ... + 6476.

It is an arithmetic number, because the mean of its divisors is an integer number (1167075).

Almost surely, 2^20775648 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 20775648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28009800).

20775648 is an abundant number, since it is smaller than the sum of its proper divisors (35243952).

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

20775648 is a wasteful number, since it uses less digits than its factorization.

20775648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5899 (or 5891 counting only the distinct ones).

The product of its (nonzero) digits is 94080, while the sum is 39.

The square root of 20775648 is about 4558.0311539085. The cubic root of 20775648 is about 274.9064056150.

It can be divided in two parts, 207 and 75648, that added together give a triangular number (75855 = T₃₈₉).

The spelling of 20775648 in words is "twenty million, seven hundred seventy-five thousand, six hundred forty-eight".