20639108 has 12 divisors (see below), whose sum is σ = 41278272. Its totient is φ = 8845320.

The previous prime is 20639107. The next prime is 20639117. The reversal of 20639108 is 80193602.

20639108 is an admirable number.

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (20639107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 368528 + ... + 368583.

It is an arithmetic number, because the mean of its divisors is an integer number (3439856).

Almost surely, 2^20639108 is an apocalyptic number.

20639108 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20639108 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20639108 is a wasteful number, since it uses less digits than its factorization.

20639108 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 737122 (or 737120 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 20639108 is about 4543.0285053035. The cubic root of 20639108 is about 274.3028423807.

The spelling of 20639108 in words is "twenty million, six hundred thirty-nine thousand, one hundred eight".