20285904 has 40 divisors (see below), whose sum is σ = 54099712. Its totient is φ = 6543360.

The previous prime is 20285899. The next prime is 20285921. The reversal of 20285904 is 40958202.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5329 + ... + 8304.

Almost surely, 2^20285904 is an apocalyptic number.

20285904 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20285904 is an abundant number, since it is smaller than the sum of its proper divisors (33813808).

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

20285904 is a wasteful number, since it uses less digits than its factorization.

20285904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13675 (or 13669 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 20285904 is about 4503.9875665903. The cubic root of 20285904 is about 272.7290849173.

The spelling of 20285904 in words is "twenty million, two hundred eighty-five thousand, nine hundred four".