20066401 has 2 divisors, whose sum is σ = 20066402. Its totient is φ = 20066400.

The previous prime is 20066399. The next prime is 20066429. The reversal of 20066401 is 10466002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18284176 + 1782225 = 4276^2 + 1335^2 .

It is a cyclic number.

It is not a de Polignac number, because 20066401 - 2¹ = 20066399 is a prime.

Together with 20066399, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20066461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10033200 + 10033201.

It is an arithmetic number, because the mean of its divisors is an integer number (10033201).

Almost surely, 2^20066401 is an apocalyptic number.

It is an amenable number.

20066401 is a deficient number, since it is larger than the sum of its proper divisors (1).

20066401 is an equidigital number, since it uses as much as digits as its factorization.

20066401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 20066401 is about 4479.5536608015. The cubic root of 20066401 is about 271.7418298972.

The spelling of 20066401 in words is "twenty million, sixty-six thousand, four hundred one".