20647201 has 2 divisors, whose sum is σ = 20647202. Its totient is φ = 20647200.

The previous prime is 20647183. The next prime is 20647229. The reversal of 20647201 is 10274602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20466576 + 180625 = 4524^2 + 425^2 .

It is a cyclic number.

It is not a de Polignac number, because 20647201 - 2¹³ = 20639009 is a prime.

It is a super-3 number, since 3×20647201³ (a number of 23 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (20647001) 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, 10323600 + 10323601.

It is an arithmetic number, because the mean of its divisors is an integer number (10323601).

Almost surely, 2^20647201 is an apocalyptic number.

It is an amenable number.

20647201 is a deficient number, since it is larger than the sum of its proper divisors (1).

20647201 is an equidigital number, since it uses as much as digits as its factorization.

20647201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 20647201 is about 4543.9191234000. The cubic root of 20647201 is about 274.3386908745.

The spelling of 20647201 in words is "twenty million, six hundred forty-seven thousand, two hundred one".