20222281 has 4 divisors (see below), whose sum is σ = 20248452. Its totient is φ = 20196112.

The previous prime is 20222249. The next prime is 20222287. The reversal of 20222281 is 18222202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18222202 = 2 ⋅9111101.

It can be written as a sum of positive squares in 2 ways, for example, as 3575881 + 16646400 = 1891^2 + 4080^2 .

It is a cyclic number.

It is not a de Polignac number, because 20222281 - 2⁵ = 20222249 is a prime.

It is a super-2 number, since 2×20222281² = 817881297685922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20222287) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11890 + ... + 13483.

It is an arithmetic number, because the mean of its divisors is an integer number (5062113).

Almost surely, 2^20222281 is an apocalyptic number.

It is an amenable number.

20222281 is a deficient number, since it is larger than the sum of its proper divisors (26171).

20222281 is an equidigital number, since it uses as much as digits as its factorization.

20222281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26170.

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 20222281 is about 4496.9190564207. The cubic root of 20222281 is about 272.4436648126.

Adding to 20222281 its reverse (18222202), we get a palindrome (38444483).

It can be divided in two parts, 20222 and 281, that added together give a triangular number (20503 = T₂₀₂).

The spelling of 20222281 in words is "twenty million, two hundred twenty-two thousand, two hundred eighty-one".