20566001 has 2 divisors, whose sum is σ = 20566002. Its totient is φ = 20566000.

The previous prime is 20565983. The next prime is 20566019. The reversal of 20566001 is 10066502.

It is a balanced prime because it is at equal distance from previous prime (20565983) and next prime (20566019).

It can be written as a sum of positive squares in only one way, i.e., 11560000 + 9006001 = 3400^2 + 3001^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20566001 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20566501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10283000 + 10283001.

It is an arithmetic number, because the mean of its divisors is an integer number (10283001).

Almost surely, 2^20566001 is an apocalyptic number.

It is an amenable number.

20566001 is a deficient number, since it is larger than the sum of its proper divisors (1).

20566001 is an equidigital number, since it uses as much as digits as its factorization.

20566001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 20566001 is about 4534.9753031301. The cubic root of 20566001 is about 273.9785844700.

The spelling of 20566001 in words is "twenty million, five hundred sixty-six thousand, one".