20220071 has 4 divisors (see below), whose sum is σ = 20229072. Its totient is φ = 20211072.

The previous prime is 20220049. The next prime is 20220073. The reversal of 20220071 is 17002202.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20220071 - 2⁶ = 20220007 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20220073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1991 + ... + 6663.

It is an arithmetic number, because the mean of its divisors is an integer number (5057268).

Almost surely, 2^20220071 is an apocalyptic number.

20220071 is a deficient number, since it is larger than the sum of its proper divisors (9001).

20220071 is an equidigital number, since it uses as much as digits as its factorization.

20220071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9000.

The product of its (nonzero) digits is 56, while the sum is 14.

The square root of 20220071 is about 4496.6733259155. The cubic root of 20220071 is about 272.4337397464.

Adding to 20220071 its reverse (17002202), we get a palindrome (37222273).

The spelling of 20220071 in words is "twenty million, two hundred twenty thousand, seventy-one".