20555404 has 12 divisors (see below), whose sum is σ = 36005200. Its totient is φ = 10268208.

The previous prime is 20555393. The next prime is 20555407. The reversal of 20555404 is 40455502.

It is not an unprimeable number, because it can be changed into a prime (20555407) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5137 + ... + 8215.

Almost surely, 2^20555404 is an apocalyptic number.

It is an amenable number.

20555404 is a deficient number, since it is larger than the sum of its proper divisors (15449796).

20555404 is a wasteful number, since it uses less digits than its factorization.

20555404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4752 (or 4750 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 25.

The square root of 20555404 is about 4533.8067890019. The cubic root of 20555404 is about 273.9315189294.

The spelling of 20555404 in words is "twenty million, five hundred fifty-five thousand, four hundred four".