20487285 has 48 divisors (see below), whose sum is σ = 43714944. Its totient is φ = 8643456.

The previous prime is 20487251. The next prime is 20487289. The reversal of 20487285 is 58278402.

It is a happy number.

It is not a de Polignac number, because 20487285 - 2⁷ = 20487157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20487289) 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 47 ways as a sum of consecutive naturals, for example, 1594 + ... + 6596.

It is an arithmetic number, because the mean of its divisors is an integer number (910728).

Almost surely, 2^20487285 is an apocalyptic number.

It is an amenable number.

20487285 is an abundant number, since it is smaller than the sum of its proper divisors (23227659).

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

20487285 is a wasteful number, since it uses less digits than its factorization.

20487285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5034 (or 5031 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 36.

The square root of 20487285 is about 4526.2882144203. The cubic root of 20487285 is about 273.6285881818.

The spelling of 20487285 in words is "twenty million, four hundred eighty-seven thousand, two hundred eighty-five".