20068281 has 6 divisors (see below), whose sum is σ = 28987530. Its totient is φ = 13378848.

The previous prime is 20068273. The next prime is 20068289. The reversal of 20068281 is 18286002.

It is an interprime number because it is at equal distance from previous prime (20068273) and next prime (20068289).

It can be written as a sum of positive squares in only one way, i.e., 15139881 + 4928400 = 3891^2 + 2220^2 .

It is not a de Polignac number, because 20068281 - 2³ = 20068273 is a prime.

It is a super-2 number, since 2×20068281² = 805471804589922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20068289) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1114896 + ... + 1114913.

It is an arithmetic number, because the mean of its divisors is an integer number (4831255).

Almost surely, 2^20068281 is an apocalyptic number.

It is an amenable number.

20068281 is a deficient number, since it is larger than the sum of its proper divisors (8919249).

20068281 is a wasteful number, since it uses less digits than its factorization.

20068281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2229815 (or 2229812 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 20068281 is about 4479.7634982218. The cubic root of 20068281 is about 271.7503160342.

The spelling of 20068281 in words is "twenty million, sixty-eight thousand, two hundred eighty-one".