20004894 has 160 divisors (see below), whose sum is σ = 58544640. Its totient is φ = 4961088.

The previous prime is 20004893. The next prime is 20004923. The reversal of 20004894 is 49840002.

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 (20004893) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 339037 + ... + 339095.

It is an arithmetic number, because the mean of its divisors is an integer number (365904).

Almost surely, 2^20004894 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20004894, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29272320).

20004894 is an abundant number, since it is smaller than the sum of its proper divisors (38539746).

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

20004894 is a wasteful number, since it uses less digits than its factorization.

20004894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116 (or 107 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 20004894 is about 4472.6830873649. The cubic root of 20004894 is about 271.4639004535.

Adding to 20004894 its reverse (49840002), we get a palindrome (69844896).

The spelling of 20004894 in words is "twenty million, four thousand, eight hundred ninety-four".