20051284 has 12 divisors (see below), whose sum is σ = 38279808. Its totient is φ = 9114200.

The previous prime is 20051263. The next prime is 20051293. The reversal of 20051284 is 48215002.

It is a Harshad number since it is a multiple of its sum of digits (22).

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 3 ways as a sum of consecutive naturals, for example, 227812 + ... + 227899.

It is an arithmetic number, because the mean of its divisors is an integer number (3189984).

Almost surely, 2^20051284 is an apocalyptic number.

It is an amenable number.

20051284 is a deficient number, since it is larger than the sum of its proper divisors (18228524).

20051284 is a wasteful number, since it uses less digits than its factorization.

20051284 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 455726 (or 455724 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 20051284 is about 4477.8660096077. The cubic root of 20051284 is about 271.6735739563.

Adding to 20051284 its reverse (48215002), we get a palindrome (68266286).

The spelling of 20051284 in words is "twenty million, fifty-one thousand, two hundred eighty-four".