20408916 has 24 divisors (see below), whose sum is σ = 51950304. Its totient is φ = 6184480.

The previous prime is 20408909. The next prime is 20408917. The reversal of 20408916 is 61980402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20408917) 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 7 ways as a sum of consecutive naturals, for example, 77175 + ... + 77438.

It is an arithmetic number, because the mean of its divisors is an integer number (2164596).

Almost surely, 2^20408916 is an apocalyptic number.

It is an amenable number.

20408916 is an abundant number, since it is smaller than the sum of its proper divisors (31541388).

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

20408916 is a wasteful number, since it uses less digits than its factorization.

20408916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154631 (or 154629 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 20408916 is about 4517.6228262218. The cubic root of 20408916 is about 273.2792430478.

The spelling of 20408916 in words is "twenty million, four hundred eight thousand, nine hundred sixteen".