20916672 has 112 divisors (see below), whose sum is σ = 64373760. Its totient is φ = 5870592.

The previous prime is 20916589. The next prime is 20916673. The reversal of 20916672 is 27661902.

It is a tau number, because it is divible by the number of its divisors (112).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20916673) 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, 106078 + ... + 106274.

Almost surely, 2^20916672 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 20916672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32186880).

20916672 is an abundant number, since it is smaller than the sum of its proper divisors (43457088).

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

20916672 is a wasteful number, since it uses less digits than its factorization.

20916672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298 (or 288 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 20916672 is about 4573.4748277431. The cubic root of 20916672 is about 275.5270202077.

The spelling of 20916672 in words is "twenty million, nine hundred sixteen thousand, six hundred seventy-two".