20404888 has 16 divisors (see below), whose sum is σ = 43724880. Its totient is φ = 8744928.

The previous prime is 20404883. The next prime is 20404889. The reversal of 20404888 is 88840402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20404883) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 182131 + ... + 182242.

It is an arithmetic number, because the mean of its divisors is an integer number (2732805).

Almost surely, 2^20404888 is an apocalyptic number.

20404888 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20404888 is an abundant number, since it is smaller than the sum of its proper divisors (23319992).

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

20404888 is a wasteful number, since it uses less digits than its factorization.

20404888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 364386 (or 364382 counting only the distinct ones).

The product of its (nonzero) digits is 16384, while the sum is 34.

The square root of 20404888 is about 4517.1769945398. The cubic root of 20404888 is about 273.2612633044.

The spelling of 20404888 in words is "twenty million, four hundred four thousand, eight hundred eighty-eight".