20320000 has 90 divisors (see below), whose sum is σ = 51083648. Its totient is φ = 8064000.

The previous prime is 20319989. The next prime is 20320007. The reversal of 20320000 is 2302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20320007) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 159937 + ... + 160063.

Almost surely, 2^20320000 is an apocalyptic number.

20320000 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 20320000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25541824).

20320000 is an abundant number, since it is smaller than the sum of its proper divisors (30763648).

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

20320000 is an frugal number, since it uses more digits than its factorization.

20320000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163 (or 134 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 7.

The square root of 20320000 is about 4507.7710678339. The cubic root of 20320000 is about 272.8817979525.

Adding to 20320000 its reverse (2302), we get a palindrome (20322302).

The spelling of 20320000 in words is "twenty million, three hundred twenty thousand".