20545284 has 24 divisors (see below), whose sum is σ = 48390048. Its totient is φ = 6784000.

The previous prime is 20545277. The next prime is 20545303. The reversal of 20545284 is 48254502.

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, 6717 + ... + 9284.

It is an arithmetic number, because the mean of its divisors is an integer number (2016252).

Almost surely, 2^20545284 is an apocalyptic number.

It is an amenable number.

20545284 is an abundant number, since it is smaller than the sum of its proper divisors (27844764).

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

20545284 is a wasteful number, since it uses less digits than its factorization.

20545284 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16115 (or 16113 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 30.

The square root of 20545284 is about 4532.6905916905. The cubic root of 20545284 is about 273.8865568351.

Adding to 20545284 its reverse (48254502), we get a palindrome (68799786).

The spelling of 20545284 in words is "twenty million, five hundred forty-five thousand, two hundred eighty-four".