20408816 has 40 divisors (see below), whose sum is σ = 41341104. Its totient is φ = 9751040.

The previous prime is 20408813. The next prime is 20408821. The reversal of 20408816 is 61880402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20408813) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34475 + ... + 35061.

Almost surely, 2^20408816 is an apocalyptic number.

It is an amenable number.

20408816 is an abundant number, since it is smaller than the sum of its proper divisors (20932288).

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

20408816 is a wasteful number, since it uses less digits than its factorization.

20408816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 689 (or 683 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 29.

The square root of 20408816 is about 4517.6117584405. The cubic root of 20408816 is about 273.2787967074.

The spelling of 20408816 in words is "twenty million, four hundred eight thousand, eight hundred sixteen".