20004576 has 48 divisors (see below), whose sum is σ = 52835328. Its totient is φ = 6627200.

The previous prime is 20004559. The next prime is 20004581. The reversal of 20004576 is 67540002.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17791 + ... + 18881.

It is an arithmetic number, because the mean of its divisors is an integer number (1100736).

Almost surely, 2^20004576 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 20004576, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26417664).

20004576 is an abundant number, since it is smaller than the sum of its proper divisors (32830752).

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

20004576 is a wasteful number, since it uses less digits than its factorization.

20004576 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1295 (or 1287 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 24.

The square root of 20004576 is about 4472.6475380920. The cubic root of 20004576 is about 271.4624620392.

Adding to 20004576 its reverse (67540002), we get a palindrome (87544578).

The spelling of 20004576 in words is "twenty million, four thousand, five hundred seventy-six".