20453664 has 96 divisors (see below), whose sum is σ = 66963456. Its totient is φ = 5310720.

The previous prime is 20453663. The next prime is 20453683. The reversal of 20453664 is 46635402.

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

It is not an unprimeable number, because it can be changed into a prime (20453663) 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, 6009 + ... + 8775.

It is an arithmetic number, because the mean of its divisors is an integer number (697536).

Almost surely, 2^20453664 is an apocalyptic number.

20453664 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20453664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33481728).

20453664 is an abundant number, since it is smaller than the sum of its proper divisors (46509792).

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

20453664 is a wasteful number, since it uses less digits than its factorization.

20453664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2798 (or 2790 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 30.

The square root of 20453664 is about 4522.5727191500. The cubic root of 20453664 is about 273.4788253122.

The spelling of 20453664 in words is "twenty million, four hundred fifty-three thousand, six hundred sixty-four".