20928404 has 24 divisors (see below), whose sum is σ = 42016128. Its totient is φ = 8935200.

The previous prime is 20928373. The next prime is 20928407. The reversal of 20928404 is 40482902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20928407) 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, 6929 + ... + 9479.

It is an arithmetic number, because the mean of its divisors is an integer number (1750672).

Almost surely, 2^20928404 is an apocalyptic number.

It is an amenable number.

20928404 is an abundant number, since it is smaller than the sum of its proper divisors (21087724).

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

20928404 is a wasteful number, since it uses less digits than its factorization.

20928404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2855 (or 2853 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 20928404 is about 4574.7572613200. The cubic root of 20928404 is about 275.5785242397.

The spelling of 20928404 in words is "twenty million, nine hundred twenty-eight thousand, four hundred four".