20064721 has 2 divisors, whose sum is σ = 20064722. Its totient is φ = 20064720.

The previous prime is 20064701. The next prime is 20064727. The reversal of 20064721 is 12746002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19704721 + 360000 = 4439^2 + 600^2 .

It is a cyclic number.

It is not a de Polignac number, because 20064721 - 2⁷ = 20064593 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20064692 and 20064701.

It is not a weakly prime, because it can be changed into another prime (20064727) 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, 10032360 + 10032361.

It is an arithmetic number, because the mean of its divisors is an integer number (10032361).

Almost surely, 2^20064721 is an apocalyptic number.

It is an amenable number.

20064721 is a deficient number, since it is larger than the sum of its proper divisors (1).

20064721 is an equidigital number, since it uses as much as digits as its factorization.

20064721 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 20064721 is about 4479.3661381941. The cubic root of 20064721 is about 271.7342460922.

The spelling of 20064721 in words is "twenty million, sixty-four thousand, seven hundred twenty-one".