20804432 has 40 divisors (see below), whose sum is σ = 45012000. Its totient is φ = 9233280.

The previous prime is 20804431. The next prime is 20804437. The reversal of 20804432 is 23440802.

It is a junction number, because it is equal to n+sod(n) for n = 20804398 and 20804407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20804431) 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, 6194 + ... + 8942.

It is an arithmetic number, because the mean of its divisors is an integer number (1125300).

Almost surely, 2^20804432 is an apocalyptic number.

20804432 is a gapful number since it is divisible by the number (22) 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 20804432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22506000).

20804432 is an abundant number, since it is smaller than the sum of its proper divisors (24207568).

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

20804432 is a wasteful number, since it uses less digits than its factorization.

20804432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2811 (or 2805 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 23.

The square root of 20804432 is about 4561.1875646590. The cubic root of 20804432 is about 275.0333050572.

The spelling of 20804432 in words is "twenty million, eight hundred four thousand, four hundred thirty-two".