20403108 has 72 divisors (see below), whose sum is σ = 57177120. Its totient is φ = 6082560.

The previous prime is 20403083. The next prime is 20403121. The reversal of 20403108 is 80130402.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 26148 + ... + 26916.

Almost surely, 2^20403108 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 20403108, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28588560).

20403108 is an abundant number, since it is smaller than the sum of its proper divisors (36774012).

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

20403108 is a wasteful number, since it uses less digits than its factorization.

20403108 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 857 (or 852 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 20403108 is about 4516.9799645338. The cubic root of 20403108 is about 273.2533171823.

The spelling of 20403108 in words is "twenty million, four hundred three thousand, one hundred eight".