20967648 has 96 divisors (see below), whose sum is σ = 60582816. Its totient is φ = 6309888.

The previous prime is 20967643. The next prime is 20967671. The reversal of 20967648 is 84676902.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20967643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65986 + ... + 66302.

It is an arithmetic number, because the mean of its divisors is an integer number (631071).

Almost surely, 2^20967648 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 20967648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30291408).

20967648 is an abundant number, since it is smaller than the sum of its proper divisors (39615168).

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

20967648 is a wasteful number, since it uses less digits than its factorization.

20967648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 396 (or 388 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 42.

The square root of 20967648 is about 4579.0444418022. The cubic root of 20967648 is about 275.7506674958.

The spelling of 20967648 in words is "twenty million, nine hundred sixty-seven thousand, six hundred forty-eight".