20665344 has 132 divisors (see below), whose sum is σ = 65045472. Its totient is φ = 5713920.

The previous prime is 20665297. The next prime is 20665357. The reversal of 20665344 is 44356602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 666609 + ... + 666639.

Almost surely, 2^20665344 is an apocalyptic number.

20665344 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 20665344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32522736).

20665344 is an abundant number, since it is smaller than the sum of its proper divisors (44380128).

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

20665344 is an equidigital number, since it uses as much as digits as its factorization.

20665344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92 (or 43 counting only the distinct ones).

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

The square root of 20665344 is about 4545.9150893962. The cubic root of 20665344 is about 274.4190225007.

The spelling of 20665344 in words is "twenty million, six hundred sixty-five thousand, three hundred forty-four".