20704400 has 60 divisors (see below), whose sum is σ = 50187264. Its totient is φ = 8208000.

The previous prime is 20704379. The next prime is 20704403. The reversal of 20704400 is 440702.

It is not an unprimeable number, because it can be changed into a prime (20704403) 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 11 ways as a sum of consecutive naturals, for example, 76265 + ... + 76535.

Almost surely, 2^20704400 is an apocalyptic number.

20704400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20704400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25093632).

20704400 is an abundant number, since it is smaller than the sum of its proper divisors (29482864).

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

20704400 is a wasteful number, since it uses less digits than its factorization.

20704400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 480 (or 469 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 17.

The square root of 20704400 is about 4550.2087864185. The cubic root of 20704400 is about 274.5917910502.

The spelling of 20704400 in words is "twenty million, seven hundred four thousand, four hundred".