20081284 has 12 divisors (see below), whose sum is σ = 37209564. Its totient is φ = 9449984.

The previous prime is 20081263. The next prime is 20081291. The reversal of 20081284 is 48218002.

It can be written as a sum of positive squares in 2 ways, for example, as 13527684 + 6553600 = 3678^2 + 2560^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 147589 + ... + 147724.

It is an arithmetic number, because the mean of its divisors is an integer number (3100797).

Almost surely, 2^20081284 is an apocalyptic number.

It is an amenable number.

20081284 is a deficient number, since it is larger than the sum of its proper divisors (17128280).

20081284 is a wasteful number, since it uses less digits than its factorization.

20081284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 295334 (or 295332 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 25.

The square root of 20081284 is about 4481.2145675029. The cubic root of 20081284 is about 271.8089958061.

Adding to 20081284 its reverse (48218002), we get a palindrome (68299286).

The spelling of 20081284 in words is "twenty million, eighty-one thousand, two hundred eighty-four".