20345284 has 6 divisors (see below), whose sum is σ = 35604254. Its totient is φ = 10172640.

The previous prime is 20345279. The next prime is 20345293. The reversal of 20345284 is 48254302.

It can be written as a sum of positive squares in only one way, i.e., 20340100 + 5184 = 4510^2 + 72^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2543157 + ... + 2543164.

Almost surely, 2^20345284 is an apocalyptic number.

It is an amenable number.

20345284 is a deficient number, since it is larger than the sum of its proper divisors (15258970).

20345284 is a wasteful number, since it uses less digits than its factorization.

20345284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5086325 (or 5086323 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 28.

The square root of 20345284 is about 4510.5746862235. The cubic root of 20345284 is about 272.9949325272.

Adding to 20345284 its reverse (48254302), we get a palindrome (68599586).

The spelling of 20345284 in words is "twenty million, three hundred forty-five thousand, two hundred eighty-four".