20308680 has 96 divisors (see below), whose sum is σ = 75441600. Its totient is φ = 4641408.

The previous prime is 20308667. The next prime is 20308681. The reversal of 20308680 is 8680302.

It is not an unprimeable number, because it can be changed into a prime (20308681) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1510 + ... + 6549.

It is an arithmetic number, because the mean of its divisors is an integer number (785850).

Almost surely, 2^20308680 is an apocalyptic number.

20308680 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 20308680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37720800).

20308680 is an abundant number, since it is smaller than the sum of its proper divisors (55132920).

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

20308680 is a wasteful number, since it uses less digits than its factorization.

20308680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8083 (or 8076 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 20308680 is about 4506.5152834535. The cubic root of 20308680 is about 272.8311156076.

Adding to 20308680 its reverse (8680302), we get a palindrome (28988982).

The spelling of 20308680 in words is "twenty million, three hundred eight thousand, six hundred eighty".