20600320 has 80 divisors (see below), whose sum is σ = 53277840. Its totient is φ = 7593984.

The previous prime is 20600317. The next prime is 20600339. The reversal of 20600320 is 2300602.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a self number, because there is not a number n which added to its sum of digits gives 20600320.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32971 + ... + 33589.

It is an arithmetic number, because the mean of its divisors is an integer number (665973).

Almost surely, 2^20600320 is an apocalyptic number.

20600320 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 20600320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26638920).

20600320 is an abundant number, since it is smaller than the sum of its proper divisors (32677520).

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

20600320 is an equidigital number, since it uses as much as digits as its factorization.

20600320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 655 (or 639 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 20600320 is about 4538.7575392391. The cubic root of 20600320 is about 274.1308980826.

Adding to 20600320 its reverse (2300602), we get a palindrome (22900922).

The spelling of 20600320 in words is "twenty million, six hundred thousand, three hundred twenty".