20688108 has 48 divisors (see below), whose sum is σ = 56523264. Its totient is φ = 5765760.

The previous prime is 20688103. The next prime is 20688113. The reversal of 20688108 is 80188602.

It is an interprime number because it is at equal distance from previous prime (20688103) and next prime (20688113).

It is not an unprimeable number, because it can be changed into a prime (20688103) 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, 441 + ... + 6447.

It is an arithmetic number, because the mean of its divisors is an integer number (1177568).

Almost surely, 2^20688108 is an apocalyptic number.

20688108 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 20688108, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28261632).

20688108 is an abundant number, since it is smaller than the sum of its proper divisors (35835156).

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

20688108 is a wasteful number, since it uses less digits than its factorization.

20688108 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6062 (or 6060 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 33.

The square root of 20688108 is about 4548.4181865787. The cubic root of 20688108 is about 274.5197480161.

The spelling of 20688108 in words is "twenty million, six hundred eighty-eight thousand, one hundred eight".