20404808 has 8 divisors (see below), whose sum is σ = 38259030. Its totient is φ = 10202400.

The previous prime is 20404801. The next prime is 20404817. The reversal of 20404808 is 80840402.

It can be written as a sum of positive squares in only one way, i.e., 19695844 + 708964 = 4438^2 + 842^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (20404801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1275293 + ... + 1275308.

Almost surely, 2^20404808 is an apocalyptic number.

It is an amenable number.

20404808 is a deficient number, since it is larger than the sum of its proper divisors (17854222).

20404808 is a wasteful number, since it uses less digits than its factorization.

20404808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2550607 (or 2550603 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 26.

The square root of 20404808 is about 4517.1681394431. The cubic root of 20404808 is about 273.2609061852.

It can be divided in two parts, 20404 and 808, that added together give a palindrome (21212).

The spelling of 20404808 in words is "twenty million, four hundred four thousand, eight hundred eight".