20408028 has 12 divisors (see below), whose sum is σ = 47618760. Its totient is φ = 6802672.

The previous prime is 20407997. The next prime is 20408029. The reversal of 20408028 is 82080402.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 20407989 and 20408007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20408029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 850323 + ... + 850346.

It is an arithmetic number, because the mean of its divisors is an integer number (3968230).

Almost surely, 2^20408028 is an apocalyptic number.

It is an amenable number.

20408028 is an abundant number, since it is smaller than the sum of its proper divisors (27210732).

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

20408028 is a wasteful number, since it uses less digits than its factorization.

20408028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1700676 (or 1700674 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 24.

The square root of 20408028 is about 4517.5245433755. The cubic root of 20408028 is about 273.2752794943.

The spelling of 20408028 in words is "twenty million, four hundred eight thousand, twenty-eight".