20308000 has 48 divisors (see below), whose sum is σ = 49906584. Its totient is φ = 8121600.

The previous prime is 20307983. The next prime is 20308003. The reversal of 20308000 is 80302.

20308000 = 19² + 20² + ... + 393².

It can be written as a sum of positive squares in 4 ways, for example, as 12082576 + 8225424 = 3476^2 + 2868^2 .

It is not an unprimeable number, because it can be changed into a prime (20308003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1462 + ... + 6538.

Almost surely, 2^20308000 is an apocalyptic number.

20308000 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 20308000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24953292).

20308000 is an abundant number, since it is smaller than the sum of its proper divisors (29598584).

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

20308000 is an equidigital number, since it uses as much as digits as its factorization.

20308000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5102 (or 5084 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 20308000 is about 4506.4398365006. The cubic root of 20308000 is about 272.8280704855.

Adding to 20308000 its reverse (80302), we get a palindrome (20388302).

The spelling of 20308000 in words is "twenty million, three hundred eight thousand".