20804472 has 128 divisors (see below), whose sum is σ = 64512000. Its totient is φ = 6168960.

The previous prime is 20804437. The next prime is 20804473. The reversal of 20804472 is 27440802.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20804473) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 86929 + ... + 87167.

It is an arithmetic number, because the mean of its divisors is an integer number (504000).

Almost surely, 2^20804472 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20804472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32256000).

20804472 is an abundant number, since it is smaller than the sum of its proper divisors (43707528).

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

20804472 is a wasteful number, since it uses less digits than its factorization.

20804472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298 (or 288 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 27.

The square root of 20804472 is about 4561.1919494799. The cubic root of 20804472 is about 275.0334813229.

The spelling of 20804472 in words is "twenty million, eight hundred four thousand, four hundred seventy-two".