20290404 has 24 divisors (see below), whose sum is σ = 49836640. Its totient is φ = 6407424.

The previous prime is 20290397. The next prime is 20290421. The reversal of 20290404 is 40409202.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44269 + ... + 44724.

Almost surely, 2^20290404 is an apocalyptic number.

It is an amenable number.

20290404 is an abundant number, since it is smaller than the sum of its proper divisors (29546236).

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

20290404 is a wasteful number, since it uses less digits than its factorization.

20290404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89019 (or 89017 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 20290404 is about 4504.4870962186. The cubic root of 20290404 is about 272.7492498249.

Adding to 20290404 its reverse (40409202), we get a palindrome (60699606).

The spelling of 20290404 in words is "twenty million, two hundred ninety thousand, four hundred four".