20446720 has 120 divisors (see below), whose sum is σ = 57378024. Its totient is φ = 6967296.

The previous prime is 20446709. The next prime is 20446721. The reversal of 20446720 is 2764402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20446721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 125359 + ... + 125521.

Almost surely, 2^20446720 is an apocalyptic number.

20446720 is a gapful number since it is divisible by the number (20) 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 20446720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28689012).

20446720 is an abundant number, since it is smaller than the sum of its proper divisors (36931304).

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

20446720 is an equidigital number, since it uses as much as digits as its factorization.

20446720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200 (or 177 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 25.

The square root of 20446720 is about 4521.8049493537. The cubic root of 20446720 is about 273.4478732065.

The spelling of 20446720 in words is "twenty million, four hundred forty-six thousand, seven hundred twenty".