20308688 has 20 divisors (see below), whose sum is σ = 39848640. Its totient is φ = 10025184.

The previous prime is 20308681. The next prime is 20308723. The reversal of 20308688 is 88680302.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 6770 + ... + 9297.

It is an arithmetic number, because the mean of its divisors is an integer number (1992432).

Almost surely, 2^20308688 is an apocalyptic number.

It is an amenable number.

20308688 is a deficient number, since it is larger than the sum of its proper divisors (19539952).

20308688 is a wasteful number, since it uses less digits than its factorization.

20308688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16154 (or 16148 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 35.

The square root of 20308688 is about 4506.5161710572. The cubic root of 20308688 is about 272.8311514321.

The spelling of 20308688 in words is "twenty million, three hundred eight thousand, six hundred eighty-eight".