20001284 has 6 divisors (see below), whose sum is σ = 35002254. Its totient is φ = 10000640.

The previous prime is 20001277. The next prime is 20001301. The reversal of 20001284 is 48210002.

It can be written as a sum of positive squares in only one way, i.e., 19998784 + 2500 = 4472^2 + 50^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2500157 + ... + 2500164.

It is an arithmetic number, because the mean of its divisors is an integer number (5833709).

Almost surely, 2^20001284 is an apocalyptic number.

It is an amenable number.

20001284 is a deficient number, since it is larger than the sum of its proper divisors (15000970).

20001284 is a wasteful number, since it uses less digits than its factorization.

20001284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5000325 (or 5000323 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 20001284 is about 4472.2795082597. The cubic root of 20001284 is about 271.4475703889.

Adding to 20001284 its reverse (48210002), we get a palindrome (68211286).

The spelling of 20001284 in words is "twenty million, one thousand, two hundred eighty-four".