20422081 has 2 divisors, whose sum is σ = 20422082. Its totient is φ = 20422080.

The previous prime is 20422079. The next prime is 20422097. The reversal of 20422081 is 18022402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12531600 + 7890481 = 3540^2 + 2809^2 .

It is a cyclic number.

It is not a de Polignac number, because 20422081 - 2¹ = 20422079 is a prime.

It is a super-2 number, since 2×20422081² = 834122784741122, which contains 22 as substring.

Together with 20422079, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20422001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10211040 + 10211041.

It is an arithmetic number, because the mean of its divisors is an integer number (10211041).

Almost surely, 2^20422081 is an apocalyptic number.

It is an amenable number.

20422081 is a deficient number, since it is larger than the sum of its proper divisors (1).

20422081 is an equidigital number, since it uses as much as digits as its factorization.

20422081 is an evil number, because the sum of its binary digits is even.

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

The square root of 20422081 is about 4519.0796629402. The cubic root of 20422081 is about 273.3379910304.

Adding to 20422081 its reverse (18022402), we get a palindrome (38444483).

The spelling of 20422081 in words is "twenty million, four hundred twenty-two thousand, eighty-one".