20286281 has 8 divisors (see below), whose sum is σ = 21809280. Its totient is φ = 18808848.

The previous prime is 20286263. The next prime is 20286293. The reversal of 20286281 is 18268202.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20286281 is a prime.

It is a super-2 number, since 2×20286281² = 823066393621922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20286241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10466 + ... + 12251.

It is an arithmetic number, because the mean of its divisors is an integer number (2726160).

Almost surely, 2^20286281 is an apocalyptic number.

It is an amenable number.

20286281 is a deficient number, since it is larger than the sum of its proper divisors (1522999).

20286281 is a wasteful number, since it uses less digits than its factorization.

20286281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22783.

The product of its (nonzero) digits is 3072, while the sum is 29.

The square root of 20286281 is about 4504.0294181988. The cubic root of 20286281 is about 272.7307744029.

The spelling of 20286281 in words is "twenty million, two hundred eighty-six thousand, two hundred eighty-one".