20287284 has 24 divisors (see below), whose sum is σ = 47987520. Its totient is φ = 6669504.

The previous prime is 20287277. The next prime is 20287291. The reversal of 20287284 is 48278202.

It is an interprime number because it is at equal distance from previous prime (20287277) and next prime (20287291).

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 10704 + ... + 12455.

It is an arithmetic number, because the mean of its divisors is an integer number (1999480).

Almost surely, 2^20287284 is an apocalyptic number.

It is an amenable number.

20287284 is an abundant number, since it is smaller than the sum of its proper divisors (27700236).

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

20287284 is a wasteful number, since it uses less digits than its factorization.

20287284 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23239 (or 23237 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 33.

The square root of 20287284 is about 4504.1407615660. The cubic root of 20287284 is about 272.7352691393.

The spelling of 20287284 in words is "twenty million, two hundred eighty-seven thousand, two hundred eighty-four".