20222791 has 2 divisors, whose sum is σ = 20222792. Its totient is φ = 20222790.

The previous prime is 20222789. The next prime is 20222827. The reversal of 20222791 is 19722202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20222791 - 2¹ = 20222789 is a prime.

It is a super-2 number, since 2×20222791² = 817922551659362, which contains 22 as substring.

Together with 20222789, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20222731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10111395 + 10111396.

It is an arithmetic number, because the mean of its divisors is an integer number (10111396).

Almost surely, 2^20222791 is an apocalyptic number.

20222791 is a deficient number, since it is larger than the sum of its proper divisors (1).

20222791 is an equidigital number, since it uses as much as digits as its factorization.

20222791 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 20222791 is about 4496.9757615535. The cubic root of 20222791 is about 272.4459551098.

Adding to 20222791 its reverse (19722202), we get a palindrome (39944993).

The spelling of 20222791 in words is "twenty million, two hundred twenty-two thousand, seven hundred ninety-one".