20804368 has 40 divisors (see below), whose sum is σ = 44919000. Its totient is φ = 9268224.

The previous prime is 20804309. The next prime is 20804369. The reversal of 20804368 is 86340802.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 446224 + 20358144 = 668^2 + 4512^2 .

It is not an unprimeable number, because it can be changed into a prime (20804369) 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, 4308 + ... + 7756.

It is an arithmetic number, because the mean of its divisors is an integer number (1122975).

Almost surely, 2^20804368 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 20804368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22459500).

20804368 is an abundant number, since it is smaller than the sum of its proper divisors (24114632).

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

20804368 is a wasteful number, since it uses less digits than its factorization.

20804368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3499 (or 3493 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 20804368 is about 4561.1805489369. The cubic root of 20804368 is about 275.0330230316.

The spelling of 20804368 in words is "twenty million, eight hundred four thousand, three hundred sixty-eight".