20988108 has 36 divisors (see below), whose sum is σ = 53366040. Its totient is φ = 6954816.

The previous prime is 20988101. The next prime is 20988109. The reversal of 20988108 is 80188902.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (20988101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4816 + ... + 8072.

It is an arithmetic number, because the mean of its divisors is an integer number (1482390).

Almost surely, 2^20988108 is an apocalyptic number.

It is an amenable number.

20988108 is an abundant number, since it is smaller than the sum of its proper divisors (32377932).

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

20988108 is a wasteful number, since it uses less digits than its factorization.

20988108 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3446 (or 3441 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 36.

The square root of 20988108 is about 4581.2779876362. The cubic root of 20988108 is about 275.8403298264.

The spelling of 20988108 in words is "twenty million, nine hundred eighty-eight thousand, one hundred eight".