20308608 has 144 divisors (see below), whose sum is σ = 63097710. Its totient is φ = 6266880.

The previous prime is 20308583. The next prime is 20308621. The reversal of 20308608 is 80680302.

20308608 is a `hidden beast` number, since 20 + 30 + 8 + 608 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 17239104 + 3069504 = 4152^2 + 1752^2 .

It is a tau number, because it is divible by the number of its divisors (144).

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 332898 + ... + 332958.

Almost surely, 2^20308608 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20308608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31548855).

20308608 is an abundant number, since it is smaller than the sum of its proper divisors (42789102).

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

20308608 is a wasteful number, since it uses less digits than its factorization.

20308608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115 (or 83 counting only the distinct ones).

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

The square root of 20308608 is about 4506.5072950124. The cubic root of 20308608 is about 272.8307931861.

The spelling of 20308608 in words is "twenty million, three hundred eight thousand, six hundred eight".