20447360 has 64 divisors (see below), whose sum is σ = 50086080. Its totient is φ = 7977984.

The previous prime is 20447353. The next prime is 20447369. The reversal of 20447360 is 6374402.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (64).

It is not an unprimeable number, because it can be changed into a prime (20447369) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27149 + ... + 27891.

It is an arithmetic number, because the mean of its divisors is an integer number (782595).

Almost surely, 2^20447360 is an apocalyptic number.

20447360 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 20447360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25043040).

20447360 is an abundant number, since it is smaller than the sum of its proper divisors (29638720).

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

20447360 is an equidigital number, since it uses as much as digits as its factorization.

20447360 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 805 (or 793 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 26.

The square root of 20447360 is about 4521.8757170006. The cubic root of 20447360 is about 273.4507262283.

The spelling of 20447360 in words is "twenty million, four hundred forty-seven thousand, three hundred sixty".