20622401 has 2 divisors, whose sum is σ = 20622402. Its totient is φ = 20622400.

The previous prime is 20622389. The next prime is 20622403. The reversal of 20622401 is 10422602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19571776 + 1050625 = 4424^2 + 1025^2 .

It is a cyclic number.

It is not a de Polignac number, because 20622401 - 2⁶ = 20622337 is a prime.

Together with 20622403, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20622401.

It is not a weakly prime, because it can be changed into another prime (20622403) 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 as a sum of consecutive naturals, namely, 10311200 + 10311201.

It is an arithmetic number, because the mean of its divisors is an integer number (10311201).

Almost surely, 2^20622401 is an apocalyptic number.

It is an amenable number.

20622401 is a deficient number, since it is larger than the sum of its proper divisors (1).

20622401 is an equidigital number, since it uses as much as digits as its factorization.

20622401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 20622401 is about 4541.1893816488. The cubic root of 20622401 is about 274.2288079359.

The spelling of 20622401 in words is "twenty million, six hundred twenty-two thousand, four hundred one".