20988404 has 24 divisors (see below), whose sum is σ = 39392640. Its totient is φ = 9749376.

The previous prime is 20988403. The next prime is 20988437. The reversal of 20988404 is 40488902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20988403) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3419 + ... + 7325.

It is an arithmetic number, because the mean of its divisors is an integer number (1641360).

Almost surely, 2^20988404 is an apocalyptic number.

It is an amenable number.

20988404 is a deficient number, since it is larger than the sum of its proper divisors (18404236).

20988404 is a wasteful number, since it uses less digits than its factorization.

20988404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4007 (or 4005 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 35.

The square root of 20988404 is about 4581.3102929184. The cubic root of 20988404 is about 275.8416265664.

The spelling of 20988404 in words is "twenty million, nine hundred eighty-eight thousand, four hundred four".