20005404 has 24 divisors (see below), whose sum is σ = 49136640. Its totient is φ = 6317424.

The previous prime is 20005397. The next prime is 20005429. The reversal of 20005404 is 40450002.

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, 43644 + ... + 44099.

It is an arithmetic number, because the mean of its divisors is an integer number (2047360).

Almost surely, 2^20005404 is an apocalyptic number.

It is an amenable number.

20005404 is an abundant number, since it is smaller than the sum of its proper divisors (29131236).

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

20005404 is a wasteful number, since it uses less digits than its factorization.

20005404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87769 (or 87767 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 15.

The square root of 20005404 is about 4472.7400997599. The cubic root of 20005404 is about 271.4662073126.

Adding to 20005404 its reverse (40450002), we get a palindrome (60455406).

The spelling of 20005404 in words is "twenty million, five thousand, four hundred four".