20364649 has 2 divisors, whose sum is σ = 20364650. Its totient is φ = 20364648.

The previous prime is 20364571. The next prime is 20364653. The reversal of 20364649 is 94646302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12299049 + 8065600 = 3507^2 + 2840^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20364649 is a prime.

It is not a weakly prime, because it can be changed into another prime (20362649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10182324 + 10182325.

It is an arithmetic number, because the mean of its divisors is an integer number (10182325).

Almost surely, 2^20364649 is an apocalyptic number.

It is an amenable number.

20364649 is a deficient number, since it is larger than the sum of its proper divisors (1).

20364649 is an equidigital number, since it uses as much as digits as its factorization.

20364649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 34.

The square root of 20364649 is about 4512.7207979222. The cubic root of 20364649 is about 273.0815188582.

The spelling of 20364649 in words is "twenty million, three hundred sixty-four thousand, six hundred forty-nine".