20328308 has 48 divisors (see below), whose sum is σ = 47773824. Its totient is φ = 7309440.

The previous prime is 20328307. The next prime is 20328317. The reversal of 20328308 is 80382302.

It is a super-2 number, since 2×20328308² = 826480212285728, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20328307) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1466 + ... + 6542.

It is an arithmetic number, because the mean of its divisors is an integer number (995288).

Almost surely, 2^20328308 is an apocalyptic number.

20328308 is a gapful number since it is divisible by the number (28) 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 20328308, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23886912).

20328308 is an abundant number, since it is smaller than the sum of its proper divisors (27445516).

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

20328308 is a wasteful number, since it uses less digits than its factorization.

20328308 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5112 (or 5110 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 20328308 is about 4508.6924933954. The cubic root of 20328308 is about 272.9189828783.

The spelling of 20328308 in words is "twenty million, three hundred twenty-eight thousand, three hundred eight".