20302281 has 12 divisors (see below), whose sum is σ = 29364660. Its totient is φ = 13516800.

The previous prime is 20302277. The next prime is 20302283. The reversal of 20302281 is 18220302.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 10791225 + 9511056 = 3285^2 + 3084^2 .

It is not a de Polignac number, because 20302281 - 2² = 20302277 is a prime.

It is a super-2 number, since 2×20302281² = 824365227605922, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20302283) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 11881 + ... + 13481.

It is an arithmetic number, because the mean of its divisors is an integer number (2447055).

Almost surely, 2^20302281 is an apocalyptic number.

It is an amenable number.

20302281 is a deficient number, since it is larger than the sum of its proper divisors (9062379).

20302281 is a wasteful number, since it uses less digits than its factorization.

20302281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3016 (or 3013 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 20302281 is about 4505.8052554455. The cubic root of 20302281 is about 272.8024574229.

Adding to 20302281 its reverse (18220302), we get a palindrome (38522583).

The spelling of 20302281 in words is "twenty million, three hundred two thousand, two hundred eighty-one".